Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6959708fe6c523…

MALICIOUS

PDF

80.3 KB Created: 2021-05-29 04:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a9bf8b73c88c4a800f1149e316abc96 SHA-1: b9474e599ded1bd996f9644ab8aa66f81ca6d415 SHA-256: 8b6959708fe6c52344c90e9b0f2a597b010d24b832651212ce194e084bbac43b
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, with a significant portion pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or distributing further malicious 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://leonvi.ru/123?utm_term=android+automation+testing+tutorial PDF link annotation
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/8933423.pdfIn PDF document text
    • https://tekovidekugowi.weebly.com/uploads/1/3/5/3/135315876/fupuriwotekivudi.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/vozevemo.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/b4073155d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff4066d01c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_605c99b56ba48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452148/normal_5fc9acba61277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_6002be3a9b59f.pdfIn PDF document text
    • https://dezojase.weebly.com/uploads/1/3/4/7/134711134/dulimowage.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/fed913c.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/9ba92546-22ea-4295-af6c-fcec30a2b1c7/tadojibabar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93318d91-7b5a-4640-8e12-6921cfb5aa92/how_to_get_iso_27001_certification_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0292b3e-0b99-4c01-bfe3-fdd5168febda/51050049177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835a237d-7cfd-4fcd-9f7f-388a450d8559/resistance_band_exercises_for_lower_back_fat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd344db6-119e-43b6-961b-05e2f3cb7d34/jikaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1b6168-1b34-430f-a69a-c7728904bed1/dc_unlocker_username_and_password_with_credits_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5318751e-2494-427f-8a7f-f822b04f3026/bodoland_lottery_result_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48079be4-9976-44f0-96c8-a0f9297dba46/saxurukubovifuzatok.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_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 5132 bytes
SHA-256: c0d96bee8cedcc3895d24d00fb13c280d98caa8086b70cc2d7bcd6a79ee7ec10
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 10956 bytes
SHA-256: 17524adb4f4c667184cbe45d47956d1e9849040686125f7b6f5c725fea193172

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