Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b432fdb4449c1c…

MALICIOUS

PDF

73.5 KB Created: 2020-12-28 03:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a8e3fb850a144632f12bb7d8c19a6a54 SHA-1: 815f63c842ea4da90e401c4b174bd7e3b6f13b7e SHA-256: f9b432fdb4449c1c11a005f7f9ee655fa249b700285e96079afabb923c72b9bc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL being https://trafficel.ru/strik?utm_term=dungeon+defense+invasion+of+heroes+guide, which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, suggests a lure related to game guides, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dungeon+defense+invasion+of+heroes+guide PDF link annotation
    • https://lomedalepa.weebly.com/uploads/1/3/4/4/134438906/sovojeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fcecfa7b974d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5fd2218def97f.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/gajaw.pdfIn PDF document text
    • https://romakajesak.weebly.com/uploads/1/3/4/5/134508807/fusor-ruzijopepu-sagipafofet-fudovefitujopaw.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/7034157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/718da3c8-be4e-46b7-8cdb-a73242540a46/kopovabuwapapozesixoxit.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/the_bourne_supremacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c3b0e6-5c25-463f-a9a2-ece2cf81e88e/72494884386.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/h._s._c_result_marksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bd91d2-f760-4dac-aec0-f2bc733274a1/ganaton_itopride_hydrochloride_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/nezafozotipafukakut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 5196 bytes
SHA-256: f1b2887339478d22561f8acadda25a52e54acdd9e064e30d9213c6a0a0d99125
font_01_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 11504 bytes
SHA-256: bbe422460ff4946369b5b2214a117b334760e8bf00b35c8ea1359db046dbdc34
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 5792 bytes
SHA-256: e0926de0241efe489dd7999ed83582ef74fb9dc90c94542b95e898f938b87c21

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