Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7236aa82640351d…

MALICIOUS

PDF

79.5 KB Created: 2021-04-08 16:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7157ec6d64c1cc1c00337736c1374598 SHA-1: 5e1ec4d27f35132bb0b33da49d6e28f62f739155 SHA-256: b7236aa82640351dd2834da10d384014f5c71ad0aec4d38ebb9d2e87671c9ba0
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://xajibur.ru/strik?utm_term=how+to+determine+grit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481155/normal_6021a66bdc7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_603419ea2739b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_6037a29e6350b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_60614319e5175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_601a42fb3d901.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/feriguwegov.pdfIn PDF document text
    • https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/fixenifedamexali.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/eb8f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5fde98d1d0f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5fe0fed215514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_60357e25c437b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_60286426072a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_6038385644fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_6056b55312c38.pdfIn PDF document text
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/30b16f0aa21a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6003b6dcdedfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60215cb55c750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fcd9b3266826.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/jogunipizo-wovawodeli.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/vazisi/muvikibavarofolipe.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/dumanalof.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/punoded.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_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 4776 bytes
SHA-256: 3ffbd77cc4c257e43efa9182d5d1a04a38f4b5437149d33ddd109c1dd5283a2e
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 11004 bytes
SHA-256: 0ce523b12b8349cc263d983630a0d71c4a4fb003696ccfb7044f52e8b55a7c0e

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