Malicious PDF — malware analysis report

Static analysis result for SHA-256 c484bc1e7bf31e3b…

MALICIOUS

PDF

74.7 KB Created: 2021-01-23 05:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 85d089d9bf12435b23db9fdec03ee1bf SHA-1: 918f0812c51719ca91eec0dae918d07508e27f18 SHA-256: c484bc1e7bf31e3b51503ea6d9ec1e4a1d52b38f22152e292839878a8fe42159
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF documents, suggesting a link farm or SEO poisoning tactic. One of the extracted URLs, https://traffset.ru/123?utm_term=how+to+measure+wavelength+of+led, is flagged as unknown reputation and is likely part of the malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://traffset.ru/123?utm_term=how+to+measure+wavelength+of+led PDF link annotation
    • https://cdn.sqhk.co/jiloduvunilu/Rrahgha/mamasugezidomudofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fff2349a3fb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5fde66af43008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_5fcc9e892b2eb.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/uVibFri/hachiman_and_yukino_married.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/8746766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5ffa7511aaba2.pdfIn PDF document text
    • https://jerumegilaguro.weebly.com/uploads/1/3/0/7/130776399/bebezivuripowav.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/dibametokimoge.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/begj7ji/arizona_state_parks_and_trails_photo_contest.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/RThbjeg/72357523832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davawina/4183555705.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/emirates_nbd_online_tt_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/imperative_affirmative_and_negative_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/wuwafu.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/combine_excel_sheets_into_one_python.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/funoriwovavud.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/answers_to_riddles_in_geometry_dash.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/75740159810.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/14731921606.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/idealism_theory_in_international_relations.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 5432 bytes
SHA-256: b43717dc6fdb5cf6439f5459e05edd611ec6b57eaaabb34a9db989be49e18e62
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 11052 bytes
SHA-256: 39c6317b654e55114b136a6f12c83356ccdb96b953072ffa69f0e4876dd65357

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