Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0a6d0a9f34efa4…

MALICIOUS

PDF

67.3 KB Created: 2021-03-05 19:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a27ed76f8ef6a2e8809e8d50d68385 SHA-1: 7d927628070d285d8bb36df11ae48650fdcce30a SHA-256: 2f0a6d0a9f34efa49d3f16ac85907f1840ceec5e8ea3ff3664c4c1f1cca3ce2b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO farms or to redirect users to malicious sites. ClamAV and ML classifiers identified this file as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to the external URLs, suggesting a lure to generate traffic or potentially phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=sidewalk+mitchell+duneier+free+pdf
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5ffa22cdbeb2c.pdf
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/393ab1aff1218b2.pdf
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/6095069.pdf
    • https://rikulaseno.weebly.com/uploads/1/3/4/4/134471776/d05124d2580b9.pdf
    • http://gulakami.22web.org/cpk_calculation_excel_template.pdf
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/genonuvilabipuvo.pdf
    • https://cdn-cms.f-static.net/uploads/4382618/normal_600d104e99c47.pdf
    • http://mananeje.66ghz.com/ebmt_aplastic_anemia_guidelines.pdf
    • https://static.s123-cdn-static.com/uploads/4483604/normal_6002fa948733b.pdf
    • https://cdn-cms.f-static.net/uploads/4455884/normal_601317cb0444d.pdf
    • https://cdn-cms.f-static.net/uploads/4470979/normal_602610bb33caf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_0ba1132f9f8d47af9679fd56d7615ed5.pdf?index=true
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_c53490822a2f4a44891a1ea019de9535.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_12a0a81b9902495ca5f21694545c91e2.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_1bf2638116224dccbefbd7287c74e38b.pdf?index=true
    • http://ramamezez.rf.gd/ingenuity_convertme_swing-2-seat_-_candler_batteries.pdf
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_94a8cf4e22f7499b8d7b91f08da39117.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9e.bin
dc3ab28e992b72e88f1681ebe42e27804dda1f3e2b6a615cd1ea540713208707		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 5476 bytes
font_01_sfnt_off0000dd30.bin
e1b282fd255b481784e1ec54e984229d0f0f080b23595e6136db4547b72f6c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 10096 bytes

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