Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48d98ea13c8da1a…

MALICIOUS

PDF

79.5 KB Created: 2021-02-01 11:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6e26ff9a2a53914912336e577622f3c7 SHA-1: d422be1695b64618186af5ba3fe3ba9bed468e63 SHA-256: a48d98ea13c8da1aa17810e74a8339612f41fef8736e5404cf5040e3de172e13
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafftec.ru/wb?keyword=go%20keyboard%20emoji%20emoticons%20instal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd661013c96a.pdfIn PDF document text
    • https://cdn.sqhk.co/vibupiwoxaro/0Hjjhii/45271351607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fc71accb0486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449172/normal_6004eef8a1d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fefe9b5c0561.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/dixix.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/xefav_mivoxixilewaf_xewowolugizew_zetekuvebesuke.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/a471bae516f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fd988f153c4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fcf29795d259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_5fe82887410ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fcff2aac6ec5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ffab608052d5.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/U6hjzLf/dapudux.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/jisugasus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fe165414d5ae.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/gffbqhe/luxomawugejabaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc629e3d4e5f.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
    • 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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 5284 bytes
SHA-256: 90d2aaa8529bc64a02d4cf043dc697fd638a8d85fe74b5494ff442927f6bdc15
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 10440 bytes
SHA-256: 8dfdf143e987199e11eb83376cf2f4094b0ed786aa3c7c4cfa33d59aced9bdd0
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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