Malicious PDF — malware analysis report

Static analysis result for SHA-256 926fecac930d1f3e…

MALICIOUS

PDF

78.5 KB Created: 2021-02-09 23:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0a984c05c4274e4966c5c825cf0539db SHA-1: ecbdcaed56cee593fbfd9f5b8d3f60b1c1e92e1c SHA-256: 926fecac930d1f3e8f2d20c1f5cde6528b3943efd87169655d8df4e86ffe2eed
176 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. It uses a callback-phone (TOAD) lure. 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-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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/aws?utm_term=drawer+track+guides PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367645/normal_6022b6fd42216.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/7cdadd589e2a.pdfIn PDF document text
    • http://site-shop.xyz/beach_wallpaper_freet19ft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5fcd9032b3f2d.pdfIn PDF document text
    • http://helplnstagram-confirm.com/elstat_ems_55_advancedarju4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_6019877339d5d.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/zazukuv-kuxajo-xirikifipuder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_6003c1e9952d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466364/normal_5fe0a81066324.pdfIn PDF document text
    • http://grusha.space/lebixememekumu8h7m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_6010890a3a876.pdfIn PDF document text
    • http://virnet77.ru/992038711930w39g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367952/normal_5ff401c056f0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fcc70962bf39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5fe896a5b7a62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe2b785b4787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 5232 bytes
SHA-256: aef47c0fa9be40cbe4a6559a219959f6279b23b8a567c1a5f38b52ba0687bfd7
font_01_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 10804 bytes
SHA-256: 39eaf4baa2a2edc357b4c98b228a997a1ba248b25bc73009ed332e195f5f45b5

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