Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d48c989c9bba2d…

MALICIOUS

PDF

76.9 KB Created: 2021-04-02 16:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac5458255116d394f29fd1998d83c67f SHA-1: e2de85432102eca6c3d182b48a1ed6964ebef1d0 SHA-256: 41d48c989c9bba2daca173fddee8252d227fe180b428b8a0afc1fc941a11c249
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links pointing to disposable domains, a common tactic for SEO spam or distributing further malicious payloads. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/123?utm_term=twisted+fate+guide+9.+19 PDF link annotation
    • http://mazanatur.space/next_upcoming_android_version_namenqud6.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_604b50fb0cd42.pdfIn PDF document text
    • http://24goodstore.site/pivememulapatazulifit6qn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_60352bfb8b903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5ffcf2ced901d.pdfIn PDF document text
    • http://sreda.city/how_to_file_business_taxes_in_floridat4n2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a179d18f-fae8-4848-bba7-4825b5413635/what_is_the_perfect_meal_to_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddda82ac-677f-4c1b-addf-2a0b8cf92812/what_book_series_is_vampire_diaries_based_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1e502b-e1b2-4910-bbf8-abdc660a2d35/zopuso.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/femogizimun.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/balochistan_board_matric_date_sheet_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f63644-a68b-4fc8-b710-d6a98992a043/tibifibumudokazobuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3cc187-4131-48a9-b69d-a526ced5f3db/montana_1948_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac419d7-052e-4374-be61-d1f3f0c9b281/poragon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26e3938-220b-49ef-8ef5-b2df2a99cf68/why_is_my_electric_fan_not_blowing_air.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_d35ffc9af0d641f0b334843fca51c226.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_7258f865819b4c4cb2201829966cc77d.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_63dba4714a484c13af81a9c4e744a219.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae29de4-972b-4a74-8767-7b6711ab4b67/vulibaf.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 5228 bytes
SHA-256: e948583d8569675b9c01f805aae86669a1c87d04a9744f69da190acc8788f5be
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 21660 bytes
SHA-256: cc2583acd7c477940969a6cbfa2b24e9c0241ee2d0c1f5fa76c843df54434909