Malicious PDF — malware analysis report

Static analysis result for SHA-256 39535f3e699be6cb…

MALICIOUS

PDF

86.0 KB Created: 2021-02-28 03:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf8a2080dc2a9d82a8f2edd733c6ed09 SHA-1: b8c6395e7b13c758ea6bfa17b9f0cbc836411e98 SHA-256: 39535f3e699be6cb7b4ef7725e601409bbddd80aae9ce952fdb8832342a7e307
186 Risk Score

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 0.9998

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://vilenefex.ru/123?utm_term=places+to+drop+off+used+clothing+near+me PDF link annotation
    • http://jotewelife.iblogger.org/spider_solitaire_iphone.pdfIn PDF document text
    • http://hotel-engels.ru/matirodubeyf1rw.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/nepuboxijivore.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/popatobima.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/fidWjgj/subway_team_valley.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/NjegSie/36588775943.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/SWCNhds/98608219771.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/zosubos-jozejevilojuf-semovoko.pdfIn PDF document text
    • https://cdn.sqhk.co/vukebomuwan/aniD10Y/pokemon_go_hub_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/aRheRnm/54598515501.pdfIn PDF document text
    • http://policyhelpcenter.com/zawugidavifosabaferrt7kv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafalibowadavuz.rf.gd/dog_tales_rescue_episode_guide.pdfIn PDF document text
    • http://rozikumopimi.rf.gd/factory_reset_command_mac.pdfIn PDF document text
    • http://sikofus.epizy.com/44727744367.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_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 5568 bytes
SHA-256: fe727928d1e7609ffd9db93889a314645028fbd8468558c668138551926d9f1f
font_01_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 18920 bytes
SHA-256: a43794cd4c6b2d5434e007a2e822aec63c513196f0b77852e940b583fc766fcc

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