Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c9f963a1dde3d5…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 14:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c47e9bea8b6c3d5f5a0d3bc5eaf61bc SHA-1: 9659f6464c6daae2a8fd84fa1d137349d984fa18 SHA-256: 93c9f963a1dde3d5b78959940b377dbf28ddcd60d495bfcde8c8c1addaf65fb4
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The file functions as a link farm, distributing numerous links across disposable hosting domains, likely to obscure the ultimate destination and evade detection. The ML classifier strongly supports the malicious verdict, and the ClamAV detection further confirms its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wix?keyword=mainstays+l-shaped+desk+with+hutch+multiple+colors+manual In PDF document text
    • http://help-mediasupport.com/solving_inequalities_worksheet_algebra_2jo8z8.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/kafekepomotisapefixul.pdfIn PDF document text
    • http://scrlt.xyz/kipsta_b700_manualu457x.pdfIn PDF document text
    • http://reduslim-siteofficial.site/wikofisamekojevosesanci30.pdfIn PDF document text
    • http://polfact.site/unbreakable_strength_hollow_knight9zydk.pdfIn PDF document text
    • http://pr-bux.online/roxeveginenevimebepet.pdfIn PDF document text
    • http://skidki-day.shop/jerokejudukopibofapuxugu0njxs.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/callidae_voces.pdfIn PDF document text
    • http://blekrossi.ru/how_to_oil_a_ridgeway_grandfather_clocka1d1q.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/the_heart_of_change_book_summary.pdfIn PDF document text
    • http://appeal-ig.com/finuron846gm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_164b7b9968ee42928cfa1d43c0a35709.pdf?index=trueIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/97460795536.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_b0326b3c065847b4b5d76dea3650e6ce.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_043ecb2d04eb42a0a58d02a1325ff88e.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_653a81389f6d4e88a0fcfdec91a265a4.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_fad66a13bc1e44108c61c32f21438d9e.pdf?index=trueIn PDF document text
    • http://peledopa.myartsonline.com/sat_subject_test_physics_online_practice.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_6f5b4ac3d9e2410ba99183832fbc63df.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5492 bytes
SHA-256: 1a737d9b0eed49775126cf22d0ec0dfe12f2b90fd39c159b43864a04d3b174e8
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 10664 bytes
SHA-256: d236cb8593cb80bcbf9d3df507b5053dd9cdac81e36fa6702376ab37ea75332f
font_02_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333