Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c70bb021b3ed8a…

MALICIOUS

PDF

80.3 KB Created: 2021-02-23 21:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 189f6a10f4a1f3d713f294891ef7a832 SHA-1: 8bb2064ecbc834da1f8d089867d9c65d9511663c SHA-256: 51c70bb021b3ed8a583bf167f8bc293578085a890047e2214f3f95fb55161b5a
134 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/123?utm_term=what+documents+are+needed+for+a+driver%2527s+permit PDF link annotation
    • http://avtovishki-msk.ru/gireng6l1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5ffd845a8618a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_6012f60912f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_602e9ad5b3df6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5fe1b65ba38cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_6030cb5390d95.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/AifXPgj/napozosapomaxorenosara.pdfIn PDF document text
    • http://xtrading.buzz/hair_salon_booth_rental_agreement_template_freekz6gz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_601973bfb33a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6032f57432b31.pdfIn PDF document text
    • http://storeyou.store/diablo_3_necromancer_corpse_lance_build_season_21fy4fq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5ff5ad7871cfd.pdfIn PDF document text
    • http://gradstroy.su/kedenexumodemqsnz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_601e173c271b1.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/gateme/megudapipogiwazibipaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 5468 bytes
SHA-256: a5efb6b9c142ab6f8612e241e96b287cda775959f11d39c27aacd94378d3f275
font_01_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 10800 bytes
SHA-256: d4b361d1b4d70a732a2b39c8a78f66ba894056ec6539e0bb4c970be8d01be0ea

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