Malicious PDF — malware analysis report

Static analysis result for SHA-256 389e1f47410da134…

MALICIOUS

PDF

71.4 KB Created: 2021-03-15 21:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 04517cea69138d95cd6b8a2530cd9361 SHA-1: 3eaa6fef584aabdc0abceb990fa48ad80b9ef4a3 SHA-256: 389e1f47410da13414eb6287a6ded42f9e1b0a830c7c8bee7af9d3eb9c66f852
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://maypoin.ru/wix?keyword=toledo+antique+show+2020+coupon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405650/normal_6001f1cf1948c.pdfIn PDF document text
    • https://tumopododekup.weebly.com/uploads/1/3/2/6/132696021/lobuwefizixoxawoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fd058d652af2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5ff6948eaa8de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_6042c241e12d1.pdfIn PDF document text
    • http://sfhgfje5df.xyz/spreadsheet_for_calculating_adjusted_cost_basee1bdn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5fd250b727dee.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/7438295ec4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_602c22d94693e.pdfIn PDF document text
    • http://fitdieta.com/44941389690i4ulz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ff76c5954189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_688324f18d9b4705a7a916e9434e380a.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_310833d8110f475c8296ebd8264b0404.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/18517942484.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/laniwatajoviwunedajap.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_26508244cd1c411295df55dfdd265245.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_f667bcad5c1c43cfb7bb0f9d035cd549.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_2f61dd997a9b4479bcf9126722c7e5e7.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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 5504 bytes
SHA-256: cc4c8d25a817ccdede4507845800609932ba6474e0086e93243f996d611bfeff
font_01_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 11248 bytes
SHA-256: ad78cbde809158a84f314fc7919f0368a52592aa92df88b561221e2664d76301

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