Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ae33cb12c1b384…

MALICIOUS

PDF

72.7 KB Created: 2021-02-21 22:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 094115e6eccb537e0dd3168a8bec7d22 SHA-1: 85b4dc777796a80fb6b52b4a31587962e0661b69 SHA-256: 47ae33cb12c1b384cbb9112c8f433612919cfa2ccb283d08dc2d51c5b2714e21
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

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.
  • 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://leonvi.ru/strik?utm_term=how+to+find+percentile+using+z+score+in+excel PDF link annotation
    • https://cdn.sqhk.co/bovokolel/Rie6U2q/xerenuko.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/ih99gcn/latest_viral_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/dViciim/tumelutamezodarewov.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/dobedufulekid-gifalod-kozix.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/5201681.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/997445.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/j2hbcOp/fun_facts_about_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ajcjgaY/world_war_z_2020_updates.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/1jhiygc/kulaxenukasatajob.pdfIn PDF document text
    • https://gebogunuwol.weebly.com/uploads/1/3/4/7/134732963/4066468.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/xipotida.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/bagisi/curriculum_vitae_template_for_first_job.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/mubovupupalam.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/psychonauts_figments_guide.pdfIn PDF document text
    • http://wisiver.rf.gd/45986854584.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/rudokupu.pdfIn PDF document text
    • http://merawaboz.epizy.com/verumamigixamovis.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/bukijup.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 5284 bytes
SHA-256: 178f003ae109a7f9f57047f7cb9f3c535636c0280983b1629af183cd3b202a1d
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 11064 bytes
SHA-256: 436e3113d03b42a369c574a6fe99c7c46bb56cfa051954a88af5cde7f3deeb86

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