Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9abcdffaf565b6…

MALICIOUS

PDF

92.9 KB Created: 2021-03-22 07:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4243d20ef37369a586be29ec1a7a67 SHA-1: cfd4bc03364fa4b0d9f7ef413b6ac7f6e3e56b36 SHA-256: ac9abcdffaf565b6cfeb4506b902c48ce184a9d025da8e21592d60286f8c4618
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM, with a primary suspicious URL pointing to mezovuduw.ru. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of a 'download button' heuristic further suggests a lure to download malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=gauge+theories+in+particle+physics+aitchison+pdf
    • https://cdn-cms.f-static.net/uploads/4451555/normal_601581cb3483f.pdf
    • http://obschee.xyz/58143143452ensa6.pdf
    • http://p-kavkaza.ru/best_build_for_curse_of_strahdkft34.pdf
    • https://static.s123-cdn-static.com/uploads/4458622/normal_5fec381342f20.pdf
    • https://benezome.weebly.com/uploads/1/3/5/4/135400217/2d4b2c0c0f.pdf
    • http://topstudy.fun/80783755946ful6n.pdf
    • https://cdn-cms.f-static.net/uploads/4484990/normal_5fd71c4d8568b.pdf
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/sajifetepipakaxagude.pdf
    • https://durezeneb.weebly.com/uploads/1/3/4/2/134235042/a2710d8970e.pdf
    • http://zathkatow.xyz/digamozaruxoxadegurekowvm8tx.pdf
    • http://psyhologrzn.ru/sexusakegukokatafa4ck5.pdf
    • https://cdn-cms.f-static.net/uploads/4412584/normal_603c62821ac1f.pdf
    • https://zavelodenewiguj.weebly.com/uploads/1/3/5/3/135314669/dagaguv-bejawerov-finaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kelageketisefuv/attitude_shayari_in_english.pdf
    • https://s3.amazonaws.com/zategafozasiru/purble_place_android.pdf
    • https://s3.amazonaws.com/lanaladu/fivolaw.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_06c54a622a904e1cb409165e9521457e.pdf?index=true
    • https://s3.amazonaws.com/rikolesafuwofar/88194880485.pdf
    • https://s3.amazonaws.com/rebomedug/kokoro_natsume_soseki_review.pdf
    • https://s3.amazonaws.com/lewuli/worimef.pdf
    • https://s3.amazonaws.com/kikunojulejuj/ansible_template_owner_group.pdf
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_921cabf2b53d45edb6e5b54b3b1ce0bf.pdf?index=true
    • https://s3.amazonaws.com/nefunupu/subaru_forester_2019_user_guide.pdf
    • https://s3.amazonaws.com/zarusegibitumet/23190163871.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_7ab54565b88e4ee49c4f342a0fdff0b6.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d9.bin
11de3db5f8f921e020874afef29cdd566ebeeaf70385e53f26460d27d32ae100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 5548 bytes
font_01_sfnt_off000119bd.bin
4822d73941e60aaf6096ef51b97f29864143354b2c54f1c40fb7207f0acc2b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16912 bytes
font_02_sfnt_off00014e20.bin
7f10b5217708b7aced76a9c7cd02a51188d2af7235ea23585d094f6560042d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E20 16248 bytes

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