Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a480582b4bbbd7f…

MALICIOUS

PDF

130.0 KB Created: 2021-03-18 16:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8758ba9a4aaa4fc537380d5ad6360a29 SHA-1: 201ccd85bdfe39a0462e064098ec9bef5aed61e1 SHA-256: 2a480582b4bbbd7ff73aea9997aacc6f2a0f0638e27dcf66f615021c7486ef56
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content across multiple sites. ClamAV also flagged this as a phishing trojan.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=cadweld+welded+electrical+connections+pdf
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5ffc49b15e62b.pdf
    • https://zokamufonokori.weebly.com/uploads/1/3/1/1/131164159/lidijomaxow-vogomuwipug-jikixus.pdf
    • https://tiramanab.weebly.com/uploads/1/3/1/8/131856622/8880713.pdf
    • https://cdn-cms.f-static.net/uploads/4482847/normal_601ee8a60c03e.pdf
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/8594023.pdf
    • https://static.s123-cdn-static.com/uploads/4416151/normal_600286901265b.pdf
    • https://luvumape.weebly.com/uploads/1/3/4/4/134438520/2fc206cf51.pdf
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/kolexosoja.pdf
    • https://cdn-cms.f-static.net/uploads/4386337/normal_6045022aa6dcd.pdf
    • https://cdn-cms.f-static.net/uploads/4369158/normal_601c6b79369b6.pdf
    • https://lavefikamov.weebly.com/uploads/1/3/0/8/130813740/lokolovabo-fuxuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_6ea6576c44ef4386950cafbc4b3d5523.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2796ec8e-0bbc-4276-af38-b20e9cebb581/rockwell_1756-en2tr_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/751e1ab4-f1a9-41ee-accd-2f0750eaa11c/87906568412.pdf
    • https://uploads.strikinglycdn.com/files/424df38d-313e-4c23-b540-22850ad08c4f/complaint_letter_to_board_of_education.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_4e3092124ea34cc48fdca4edf5e13bda.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_30cf3688102f4aa6b6d8a434fce164b2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1dfb1695-0c34-4f04-b33d-79d086524426/79708005967.pdf
    • https://uploads.strikinglycdn.com/files/cdebc474-2fb1-44c7-9052-bdee23d2438d/xaxaxusigegananoben.pdf
    • 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_off0001bc77.bin
79dd09b577ab5246c91b8244934e5cf3a458670b486fc89e09e8e70cb29995e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC77 5148 bytes
font_01_sfnt_off0001ce18.bin
0062f1c1c0e1f9c930aaf12f4ec81d68262030df08b556d86b0c034e1b205da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE18 12580 bytes

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