Malicious PDF — malware analysis report

Static analysis result for SHA-256 9663288cf049482f…

MALICIOUS

PDF

83.1 KB Created: 2020-11-16 16:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d853fbb49486a3b0c097c2d78a75485f SHA-1: 4ad8ebd8b4d445535d68ebcc76b48d58bcf76070 SHA-256: 9663288cf049482f7cd4079eb6bea8adaf6b52f4bc9713b6c9b091b926d7ef49
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 0.9996

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://trafffe.ru/strik?utm_term=pour+apprendre+%25C3%25A0+chuchoter PDF link annotation
    • https://gidakilubokaz.weebly.com/uploads/1/3/4/6/134607675/kavuvobukijewoku.pdfIn PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/7611586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f8eaf91de110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5f9a9d8e4523a.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/ca1683013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5f934f8d4bc85.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
    • https://s3.amazonaws.com/fikuvine/watch_joker_online_free_english_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3651c7b-efe0-4af1-9633-416d8a555177/persuasive_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/vijuvaxazesajetegana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26b4b1c-fece-46a7-b213-2d5a112493e7/49195047008.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/zezixojatevilumideza.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/56649890584.pdfIn 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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 5020 bytes
SHA-256: 356161971480558df5a32cbde09ad9cf6c150165e505592e1a6a37523457a893
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 12652 bytes
SHA-256: e72b09e29009b9fb01959c44536b1e0996350e2a22aca0e8b07a4b999b157309
font_02_sfnt_off00012fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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