Malicious PDF — malware analysis report

Static analysis result for SHA-256 56543d588ce9b90d…

MALICIOUS

PDF

83.0 KB Created: 2021-04-01 06:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5bc3b1d96e156ae3f2342777d859c940 SHA-1: 7238ca302c65fd50bf3d70af7749d105b87782ac SHA-256: 56543d588ce9b90d89b0f81348709228ee6675b85a4ab9cc8b6b8ce8a2867112
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to attract traffic. The primary URL, 'https://mezovuduw.ru/award?keyword=aulas+de+viol%25C3%25A3o+pdf+download', suggests a lure related to guitar lessons. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely 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://mezovuduw.ru/award?keyword=aulas+de+viol%25C3%25A3o+pdf+download PDF link annotation
    • https://wutipukuze.weebly.com/uploads/1/3/5/4/135401391/6d6782f.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/gunusewariwopiso.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/85626745055.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/latex_beamer_no.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/rotulabigubu.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/0ffd6df51d.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/nonewoxiruk.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/tutid_bebafikiwa_vikimelejak.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/dagasopones/sunofazixu.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/multiplication_games_4th_grade_printable.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_19c8f5d6dc394ba2afff0c36545cf323.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_697c05ede8ab4ed5853389dd6c2364ca.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_f381fd9d53e14af0a313faefb07bb05f.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/bsa_merit_badge_salesmanship.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/aliens_vs_predator_movie_in_tamil.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/how_to_install_fastway_e2_hitch.pdfIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_e7a53465f0104809ad01fbcf851cd975.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamovagag/runexifemitidokokoko.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/sullair_375_compressor_service_manual.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_ab0cda1c49304aebbd184318ad32f356.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_ac6a751e48494e10a2438aa1bcbaf3ba.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_d38d10516338455a89e2c3241953cc9e.pdf?index=trueIn 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_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 5396 bytes
SHA-256: 020b3c2e3613352abcd6f1f1a3a4c5c48274b78e59c891a428ea797dd21087ea
font_01_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 13972 bytes
SHA-256: a03f0b2665096fa746ded6e9c85a3cc5ba0fb758d9be4f10943a39de3ad96bf7

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