Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6708c9ccf0abff1…

MALICIOUS

PDF

80.3 KB Created: 2021-02-17 12:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3034ca6f1d2494a29141c2b9534cf172 SHA-1: dd8c458e5fe9b01821f2b80838cf08a8ad3cd215 SHA-256: c6708c9ccf0abff1bedf8a9b01349f5b21d535a14bffe8f6f528c472656dae88
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=shell+tube+heat+exchanger+calculation+excel PDF link annotation
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/mididebatovebazasiw.pdfIn PDF document text
    • https://cdn.sqhk.co/mubikidom/gfUbiiC/73461976940.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/Hge4Gih/52873599864.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/ihhchey/67236763212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd94066004df.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/jigfgdI/dilezus.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/vghjd6q/free_stuff_finder_cvs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_602c2f42bfb0f.pdfIn PDF document text
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/94508.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/WgiDjis/dj_sound_effects_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fc75480d990c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_601df83bb5795.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/icWVgjo/zomavulosuvufuvitetekefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_6009273457fa5.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/tinajabizoreguf/boat_racing_games_for_pc.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_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5076 bytes
SHA-256: 7a39049356c32dfb336182665fe93dc7bbb251d0c0cc16a17135148a15394319
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 11328 bytes
SHA-256: fa991a94cfc70577121787a2e16751928182c0e7be5f5cc4b7730d42f76d6a8a
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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