Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa292e9c2970e46e…

MALICIOUS

PDF

121.6 KB Created: 2021-05-07 23:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f9810a5dd93c9ec6891136670ff71534 SHA-1: dc1d7c440da3b1d6152e3947695219d312d3ea55 SHA-256: fa292e9c2970e46eb231acd3732b09181490f771c7d1955a343b9a39fcf2f335
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector at 'https://dafemum.ru/strik?utm_term=the+choice+ullu+actress+name'. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=the+choice+ullu+actress+name In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_5fd16e733ac6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_602b369706ff9.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/e7hhjcE/fast_and_furious_tokyo_drift_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/bocli4n/25909294235.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/igj2ge8/paradise_mini_golf_parksville_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_6049c36d94eb5.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/5Wgtahc/best_ipads_right_now.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/i8rHhiv/microsoft_sharepoint_online_backup_policy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_3a42c7c3dc34422b97f3d804d99c91ec.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_8d41e2b4141746f48a0799a7e357e45e.pdf?index=trueIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_afaa6a32cca34218abc55cc86b34c444.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_51905a668ee94c82b9f4851788448cd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb51e8f-c172-4cee-95a6-452f2d7166d9/hoover_steamvac_spinscrub_not_suctioning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24dac94-c9de-427e-8ce7-39bd47701d6a/lojerukavetukojisuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc9bf74-28a9-4628-a891-e2168b2e3a95/miferujinifirigoralugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7bd50b-3d77-4262-92ff-2a55c53c5c35/fojibub.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_bf66c6dc3db44564a734cac748233f85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2fa791-7e98-419a-8e1a-55b900d7d198/46585021322.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_fdc20bc2e63c44ff97b02ab9dfe2dfb7.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_cc821cf5659b45be9bd9efa081aca464.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_e55dab96219f4388a22a0c31291e25ea.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_bfe531aa9da94420b5ac1c5d6d877ba7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A13 4988 bytes
SHA-256: 3cd35895e83528ef9fe3180a607f0a7bd297f80a1f946da77ddb23570269114c
font_01_sfnt_off00017ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD8 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00018633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18633 2056 bytes
SHA-256: 3e8ed344539c855bdadb7591c39fa96fee5851811b4c47a84c317bef7de2b1c9
font_03_sfnt_off00018fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCC 11532 bytes
SHA-256: 18557fde19238b194a934a4bc5b34b8db15c5852c482f9eb8e551a350cd733dc
font_04_sfnt_off0001b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B763 10268 bytes
SHA-256: 8d4dcb317b73458ba2fe5a976415f0980067c9c5ab09e18f5dbed0d7848aa22e

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