Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81a956cc70a9b61…

MALICIOUS

PDF

72.3 KB Created: 2021-06-03 11:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a37c8970584539a8b8adc417a5ce7e3c SHA-1: 04f80f9cc0cbcc4cab17657832b78580b96f4005 SHA-256: e81a956cc70a9b6182d8faefa65dfc96a7dcbcbec94a97d0c73919f0b6dff82c
126 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to disposable hosting sites, suggesting a link farm designed to obscure the ultimate destination or distribute multiple payloads. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/pbw?utm_term=biblia+de+las+americas+descargar+gratis PDF link annotation
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/b7f984d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5fc6730d2f3a6.pdfIn PDF document text
    • https://xoxizanelanoruf.weebly.com/uploads/1/3/0/7/130740612/majimabumoviwo.pdfIn PDF document text
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/bikam.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/nibigutababina-roxilabu-fafolab-dagus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_60240ed777534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426132/zexanemilibofogupuvuz.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443328/romonomusivitexob.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144420726/d_pharmacy_mcq_questions_and_answers_download.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423312/what_does_rikki_tikki_tavi_represent.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144477972/runipefunajomukus.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/tesevokalekadugovoxobi.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144518250/54127522689.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144493452/harry_potter_and_the_chamber_of_secrets_nintendo_gamecube_rom.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144454152/rosarovisadosipitufapuvi.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/adverbs_worksheet_for_grade_4_with_answers.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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 5448 bytes
SHA-256: 48b9b9341580d953d339073ccc37b743ee1afba4092925fef9933fa8a8ea0a78
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 11724 bytes
SHA-256: b9394ae3e1004e775a71344372c6679f581cdd02c33b1a8d34174255d65f9cf6

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