Malicious PDF — malware analysis report

Static analysis result for SHA-256 6156192a556aaa31…

MALICIOUS

PDF

134.2 KB Created: 2020-11-25 09:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 50f376840f169c793197bdb23d290edd SHA-1: 5699c82a54e0e32449f4efb23cd607d0148d9f37 SHA-256: 6156192a556aaa31a4c86cf210006a6dda354074747f748a2f1857da873a052b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The document body, though heavily obfuscated, suggests a lure related to a service manual. The presence of numerous external URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafffe.ru/123?utm_term=ariens+yt1138+service+manual PDF link annotation
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/5922405.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/48cdcad4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f95109aa145c.pdfIn PDF document text
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/volukidametomazori.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/fujonamiv.pdfIn PDF document text
    • https://dobuxavebixeli.weebly.com/uploads/1/3/4/7/134725246/2014823.pdfIn PDF document text
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/a210440084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fb8b7411bebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5fba9904c64e1.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/forowi-ropuvikajiko-mogatete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5D9 5504 bytes
SHA-256: f6aecf9b3704ad27b83a70d9b0d4d24ed38e204499b1e587a897d1c044556410
font_01_sfnt_off0001d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D88F 16376 bytes
SHA-256: 0c3ab14e7520b60ecb800a1dafd22baaef29acc3c638a5fd6e1af5222d619b05

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