Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75e562d94c20fda…

MALICIOUS

PDF

74.3 KB Created: 2021-03-06 07:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e33589d4e4161e8bfe9cbd5c84ee69be SHA-1: 7febeec9f2850ebc2338c27ec2fb8eee2329e332 SHA-256: b75e562d94c20fda422702722e8e3d867e777fa14cf20892605c7fd74750d794
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious or deceptive content.

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://nipisod.ru/wb?keyword=alesis%20dm6%20module%20for%20sale PDF link annotation
    • http://vajogeboru.iblogger.org/fluke_179_user_guide.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/ziriveru.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/nightwood_djuna_barnes_characters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_ca176ddaa2494007a5060aae5fd90ad2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c40333-cef2-4e0e-98ca-1ca8afb383e2/nolukisewuxezusejojo.pdfIn PDF document text
    • http://bitines.myartsonline.com/how_to_estimate_road_construction_costs.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/dead_or_alive_5_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cd14bd-454f-48c1-8890-56afecb44ab3/lokuzobunifixagifebawawam.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_6c27a39f371242ee96d1f6a4bd47e1ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d779c38e-d395-434d-83e2-3a0e41df548e/density_worksheet_chemistry_in_context_2008-9.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_56f547a1725d4937a0244ff47d20b291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfe2d87-6ae8-4e35-8bb1-ddbd0fc79ed9/16465851074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72f8a89-e0bd-4831-8d49-d57ebe580603/walter_riso_desapegarse_sin_anestesia.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_67ec3b317f774063be455141f25b915b.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/officejet_pro_8600_ink_cartridge_replacement.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_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 5196 bytes
SHA-256: f07628975e3a20fa5b9370b7ffde2d292a09227d289211bae8947118339b7fa8
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 11044 bytes
SHA-256: 2a839aef80b66a9ed94d7c0238b4828805db0bc48c952acd95f86b85109c8a43

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