Malicious PDF — malware analysis report

Static analysis result for SHA-256 82185cd921506cdc…

MALICIOUS

PDF

76.8 KB Created: 2021-02-23 21:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c9b9911c0fc86e61cef585549e543b76 SHA-1: 5227574627ffb80a4bf0dd3da8473ce97d7abece SHA-256: 82185cd921506cdc19c78a53483c572056a7c9a971651141085284cbed2cd2ef
186 Risk Score

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=descargar+musica+gratis+ana+gabriel+el+cigarrillo PDF link annotation
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/366006.pdfIn PDF document text
    • https://wokusozevopiwaj.weebly.com/uploads/1/3/4/3/134381386/c5cfacb34ec.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/hwVkheT/jozeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/cL9OKMy/20919240948.pdfIn PDF document text
    • http://cucoupon.info/38368810989h57h9.pdfIn PDF document text
    • https://bogewugarut.weebly.com/uploads/1/3/1/4/131483108/5902c94428.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/JjioTJL/58329046387.pdfIn PDF document text
    • http://podarokinsta.online/fozabito9latc.pdfIn PDF document text
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/23091.pdfIn PDF document text
    • http://on24-system.club/ropilaselijogejeminf29h.pdfIn PDF document text
    • https://fadesirowawilej.weebly.com/uploads/1/3/1/6/131606674/mufametewobug.pdfIn PDF document text
    • http://onlajn-kassa.ru/723492166313k6xx.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/tikuri.pdfIn PDF document text
    • http://profer-opt.ru/64655733486072n2.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/hdYjeew/best_spinach_artichoke_dip_pioneer_woman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezerawe/alan_walker_darkside_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 5260 bytes
SHA-256: f7df12051d2f1d12ec8b21dfc78697d0fe91050011dd0932313e7834a8092299
font_01_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 11892 bytes
SHA-256: 1520b13334ef6a76c9cb5a49de39b80deea8de07a084097b1c7548f36427c571
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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