Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b4df2683f493e…

MALICIOUS

PDF

69.6 KB Created: 2020-12-16 05:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a620d28d4a6bb4a88e8182fb9a918b9 SHA-1: 1a122d9a8d1615b3d1f1f17095bb6be852575624 SHA-256: 898b4df2683f493e2989d42530292cae54934ef091a40c2080498b67b7ecc6aa
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The presence of 'utm_term=human+magnet+syndrome+pdf' in one URL suggests a lure, possibly related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=human+magnet+syndrome+pdf
    • https://bawimivumo.weebly.com/uploads/1/3/4/6/134609907/15413b83092.pdf
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/e4450.pdf
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/6987474.pdf
    • https://vezutubiwewo.weebly.com/uploads/1/3/4/5/134507618/fiwomen-nabagavuj-kamofedub-vesilirekapeg.pdf
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/getes-govawujuwukox-wiwitipasekesut.pdf
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5fbb856e68a85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfe4a2dd96f5918b4887a/1606286923693/wup_installer_wii_u_juegos.pdf
    • https://uploads.strikinglycdn.com/files/7ce49f0b-30ba-49dd-8713-21b91b0ba07d/59252557846.pdf
    • https://static1.squarespace.com/static/5fcea14de29cf17e8f702bb6/t/5fd6705396ed101a3e428c66/1607888980102/21297154869.pdf
    • https://uploads.strikinglycdn.com/files/4ebfe9bb-bdf9-4be6-a8e9-5408dcec2fa7/gisudumat.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe092108845d0924515708/1606289697935/cajun_injector_turkey_frying_instructions.pdf
    • https://uploads.strikinglycdn.com/files/53804954-a2a8-4f25-9e13-ba4fc3247a2f/pokmon_game_boy_advance.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_off0000d2da.bin
1bd34a7d18e7fb9120721ff11c9a46aa481f407b508bfa7380b7a210adf243ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 5392 bytes
font_01_sfnt_off0000e51e.bin
397be617c9198716a1ba2bb9109eb0fe76370e68949979e938c31708f6348841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10796 bytes

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