Malicious PDF — malware analysis report

Static analysis result for SHA-256 96682fe4c4438d79…

MALICIOUS

PDF

69.5 KB Created: 2020-12-27 01:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2603b3afd1ccbd0edb11a5059c50cc10 SHA-1: d46e8755a2d0bbccb7c12a891b3402602d5f9c4e SHA-256: 96682fe4c4438d79d277f772af3d45a2f44dcc0a9ec12163a516338f702de5e5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/strik?utm_term=jelly+shift+poki
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/9987128.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/bevazag_mojevawuzeze_vetewex_sosesika.pdf
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd39f0033a55.pdf
    • https://sopesurikef.weebly.com/uploads/1/3/5/3/135317881/8b7029a04aa1160.pdf
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fd388a228cb9.pdf
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/7720301.pdf
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd64fade82b3.pdf
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fde5724bcde0.pdf
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5f99c20550d8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f3701cda-d009-47ed-8c77-3cffcd3b333c/the_grotto_portland_oregon_hours.pdf
    • https://s3.amazonaws.com/dinilederu/echhs_staff_directory.pdf
    • https://uploads.strikinglycdn.com/files/8af3e82a-1b3a-404e-9508-052141999f17/26332065016.pdf
    • https://uploads.strikinglycdn.com/files/39d2c284-f529-4870-b3c7-e4917b774b89/87356314594.pdf
    • https://uploads.strikinglycdn.com/files/6d9e9c20-a6d8-4703-9b95-bdee6733d959/22425033605.pdf
    • https://uploads.strikinglycdn.com/files/d7901908-752d-4197-8218-c2fd292fdfac/palodonedutudoganiwezedaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e1.bin
facf6a6156af78cc7f7f4cc80cb278f91df5fa7ea33f2ae6412ab7298c186b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 4836 bytes
font_01_sfnt_off0000e567.bin
ef6b7814a635b4e4f1887a6291f5da0d15e7ed5804c4e05f048094ab6ae15a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 10704 bytes

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