Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad97840e72637d73…

MALICIOUS

PDF

84.6 KB Created: 2021-04-19 10:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0176dca655da094ecd8b38e5ac69b2f8 SHA-1: 508d96a21bcfa9cf82848dd2ba58d27632fd3286 SHA-256: ad97840e72637d73835b0502f58d0af59835b0413ae6429d522e328fee2e76f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=mesa+boogie+dual+rectifier+multi+watt+manual PDF link annotation
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/13051500bc69.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/free_sample_behavioral_interview_questions_and_answers.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/gamikaxawem_nidujoxixulasun_mexeda.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/gaxuvunateki_bedeso_nozibu_wowewo.pdfIn PDF document text
    • http://gewebufokorilu.iblogger.org/bemiwomumojebubuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5ffbaf091a07e.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/27742347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60134ce4f141b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_6044cb1a1c087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447085/normal_5fdde99e59e02.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/lakidurudawese-mawigepiranof-lojuz-pitudime.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/ginasu.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/satudifin/89296242672.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/puda_bye_laws.pdfIn PDF document text
    • http://paludibedujeg.epizy.com/6867544737.pdfIn PDF document text
    • http://kosatalek.rf.gd/bexazimabosatetaxepomefeg.pdfIn PDF document text
    • http://zotubune.myartsonline.com/how_to_write_a_health_and_safety_manual.pdfIn PDF document text
    • http://vefejabenu.rf.gd/58998511322.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/gosamababadowek.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_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 5576 bytes
SHA-256: 8018e36653302b2186afac488fa5d29ba13c814aae113e291aceb1cdc6db45f3
font_01_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 11080 bytes
SHA-256: 5cc970f12c4594406e646c98fbadd2b0873248acd555965eba1830a000c99107

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