Malicious PDF — malware analysis report

Static analysis result for SHA-256 393fae6f1f625389…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 18:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4861ed08b291b69ef29d29cf9a0385e5 SHA-1: ad5e2b7c3ad4912a17cbde800706408ef4ff12b0 SHA-256: 393fae6f1f6253895f6964f69f7eeb7d0c63f9949ca6b59221743b66ab7ab2f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or SEO spam campaign. The primary URL, 'https://druttle.ru/award?keyword=labelled+world+map+pdf', indicates a lure to a site offering a 'labelled world map pdf'. No scripts were extracted, but the PDF structure and link farm activity strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=labelled+world+map+pdf
    • https://cdn.sqhk.co/takularozo/fpGYRhi/lizudazowepulutule.pdf
    • https://cdn.sqhk.co/tobamozusaj/gjnijje/66399942400.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/6739876.pdf
    • https://cdn.sqhk.co/vesagivara/hhxhjib/89904612863.pdf
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/desij_zobepavu.pdf
    • https://cdn.sqhk.co/tisumusef/shfgEif/bowutonafimexoletozed.pdf
    • https://zovoxokovu.weebly.com/uploads/1/3/5/9/135957880/liwedukufinozetag.pdf
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/86e8115095f1.pdf
    • https://cdn.sqhk.co/wemerofada/jjhgHhi/katirapibelajojotibotomu.pdf
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/2725510.pdf
    • https://nenatuver.weebly.com/uploads/1/3/4/0/134017756/muzadafavi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/godewumazek/difference_between_iatf_and_iso_9001.pdf
    • https://s3.amazonaws.com/kavalukato/which_one_is_a_popular_tool_used_in_agile_software_development_rexx.pdf
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_d7fc574b422e40c6aec8c1783de01cb1.pdf?index=true
    • https://a01f0313-f680-4530-87a9-ce77a10bb621.filesusr.com/ugd/ac0554_8f36abb4e9fa484e8918e914e0d56aaa.pdf?index=true
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_31010042205e4d7e8d34e2651951cebf.pdf?index=true
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_1f279ba52f0b44aba8e407b91782042a.pdf?index=true
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_c3716b7cff08454d942ade49e795a413.pdf?index=true
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_6fff25fea089486185068a3bb0f7ab35.pdf?index=true
    • https://s3.amazonaws.com/loxopudizus/8970624662.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_423be0cfb7a2453b82f7f31852320182.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f158.bin
aa09069a186c835339cc89dff67afc39f15e455f665cecf0058ba04d81051033		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5180 bytes
font_01_sfnt_off000102f1.bin
6ecce2154053efba3e52d86fb7b8eee4591135355e148439bbda2909169348c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10844 bytes

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