Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a8a13158ce5e25…

MALICIOUS

PDF

72.4 KB Created: 2021-06-03 06:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 272fed05b0a17a7fff115f062c03b715 SHA-1: c690d586ab1f332165611881c582f2b6d4e1f36e SHA-256: 10a8a13158ce5e2555a8d742a30e5574a604d4358339296296f91b9cb320c7d5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating a potential link farm or distribution mechanism. The heuristic 'PDF_SEO_LINK_FARM' specifically points to the presence of numerous external PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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://jumiwimov.ru/wb?keyword=does%20epic%20work%20on%20mac
    • https://cdn-cms.f-static.net/uploads/4455207/normal_5fd36964dc680.pdf
    • https://sulewonabesonu.weebly.com/uploads/1/3/2/6/132682327/c9e1b568.pdf
    • https://cdn-cms.f-static.net/uploads/4457604/normal_6030838c37bb9.pdf
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/247538.pdf
    • https://cdn-cms.f-static.net/uploads/4371524/normal_603d28c57faa6.pdf
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff2851e466d1.pdf
    • https://nojokubovurob.weebly.com/uploads/1/3/1/6/131606526/gufut.pdf
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/faviwabozun.pdf
    • https://xagujefi.weebly.com/uploads/1/3/4/7/134749278/gujunugefowafekula.pdf
    • https://static.s123-cdn-static.com/uploads/4376125/normal_5fedc68d2efa9.pdf
    • https://zagumugapepari.weebly.com/uploads/1/3/1/6/131636872/7d59e538c2416.pdf
    • https://cdn-cms.f-static.net/uploads/4451220/normal_6058c3255d44c.pdf
    • https://static.s123-cdn-static.com/uploads/4393631/normal_600988019e61d.pdf
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/7806796.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8411d1d2-74d8-43e3-bd2a-2211e51f5508/renuwu.pdf
    • https://uploads.strikinglycdn.com/files/59c5fe8e-ca1b-44c2-a4d5-7e6e8245a4ad/jegawasiliruzutop.pdf
    • https://uploads.strikinglycdn.com/files/e9b8edec-ccf5-4d05-86a6-c8242fdc436c/vajagafajidetodoren.pdf
    • https://uploads.strikinglycdn.com/files/29f4c351-a32b-4987-8104-a115068f3ec3/jepewuful.pdf
    • https://uploads.strikinglycdn.com/files/fb3d6234-0731-4039-945b-df765db4846f/is_the_economy_crashing_right_now.pdf
    • https://uploads.strikinglycdn.com/files/ec50b880-2c83-4ede-b2f6-9ed0cf16ea1f/apple_iphone_5c_case.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_off0000ded2.bin
7caa496616b907d927b2b0fd668ed4f30ad9253464404b2faecb82b761f6c452		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 5204 bytes
font_01_sfnt_off0000f089.bin
c39619bbbf0d9e602336e4bbe3797b22f633504978a60b8d5e9bd49afe45a948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 10636 bytes

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