Malicious PDF — malware analysis report

Static analysis result for SHA-256 5170369ddeba0242…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 05:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3a6b2b2cc735e8680ffed873b902dcd0 SHA-1: 382442d9848f83f011c0e7f6cc3ffbe03aea2202 SHA-256: 5170369ddeba02421e9048f722d22d5bcb8dc29822c37f2d677d44d17d08f2de
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded URLs likely lead to malicious content or further infection stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=books+never+written+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/xurokagozagu/7m4ie2f/4637737044.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/IcF4jif/swing_shift_jobs.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/1396629.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/4807999.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/ILjgChi/2774233862.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/vimujuvovirafog-vepumoxalegapo-kofufi.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/870b527efb74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pubopelej/76395884740.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/fapasisa.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_14ef0d34a78c42ba94ce1f6b592e9ee2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/marvel_future_fight_game_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/how_to_learn_english_pronunciation_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/59491604733.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_828166a8752843348aa7a1a5e242b9d5.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_215ee45caf2e42c7b30ebfacd6f6ab06.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_33b221bcefeb47f4a21ab406a7a52bdf.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_5d48996451184ffd9d1077395f4f6a59.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_a6f8c30f78ed48b3b9a802665a3485f7.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_40fe92c0b6874c9caec3c83df636318c.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_cf19ce444d304610a962531ceade8c27.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_1a388d55eea548c187c47733cdeb5a53.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5004 bytes
SHA-256: 7782ffac964fb21ebc8a049abf414cf95b7265409260b021e07d48b556e7be9f
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10088 bytes
SHA-256: 6d3125ccbc75269a0049f50ac312fc0808956d394a3ab1f186cfcff36e60cbdc

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