Malicious PDF — malware analysis report

Static analysis result for SHA-256 849ebeeeb3509fd2…

MALICIOUS

PDF

75.9 KB Created: 2021-04-29 12:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 024f587bb1cc14434b594d6b0a4c36ed SHA-1: 73b9b35f8ea3549d5a7d3fb7b016784c006b68fc SHA-256: 849ebeeeb3509fd233eec082f77802ce992bc09822e75578a3ea4a4037331fa4
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/strik?utm_term=draw+the+circle+wide+gordon+light PDF link annotation
    • https://cdn.sqhk.co/bezakebijuk/giPuolJ/56387131749.pdfIn PDF document text
    • http://meetcabinets.xyz/3289554830640wja.pdfIn PDF document text
    • http://itsnat.space/database_design_for_mere_mortals_downloadkrlgi.pdfIn PDF document text
    • http://firstflirts.site/15514707481gtxyl.pdfIn PDF document text
    • https://dabekigojevuj.weebly.com/uploads/1/3/4/6/134636423/liwozovu_rejokoziwategi_puvuroliwerej_fafoga.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/jarCoji/bkash_app_login_without_sim.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/jgih6ib/snake_mania_facebook_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/uYMgfjd/subway_surfers_characters_unlock.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/a188fbaed1233.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/jevaYjh/flickr_photostream_vs_album.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/yNdHiie/video_poker_trainer_app.pdfIn PDF document text
    • https://fisikovomit.weebly.com/uploads/1/3/4/6/134652659/sewefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1345ace-7c2f-4447-9066-cce9106f45cb/24046711878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c503eec9-99c9-4ec2-aadd-542d46c736b4/physics_for_scientists_and_engineers_giancoli_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9812656-7ab6-44c3-8d99-bc033fc37137/sweat_lynn_nottage_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/9648122482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7fcd43-842f-4a1c-bbb8-2c8249d12fe9/23383989504.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/97004367440.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 5116 bytes
SHA-256: fafcc3929ec2a336ea19c79e500a0ad3fae47ea7c30bc5980499a79cd68078b4
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10548 bytes
SHA-256: 63f48b628fe0cf48c993822331f9d0884ab0d7cd26afcaf74e8f86b541d2051b

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