Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea4c9a87becab06…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 17:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4e60b787ce308eda104d2cf4f5f4c50 SHA-1: a26543d94b9438e8f87b70ecba9bdf73f5f53120 SHA-256: 7ea4c9a87becab06e5f6c05ad8065339666b50402e2baf9c132d1c181b6f5695
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable or low-reputation hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it's a disguised PDF, further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://jumiwimov.ru/award?keyword=affaire+de+coeur+danielle+steel+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fe7d8d726333.pdfIn PDF document text
    • http://jusefaw.22web.org/cimbali_m39_dosatron_manuale_italiano.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/lowiwofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_6006bc5b59c25.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/how_to_calculate_interest_on_loan_in_accounting.pdfIn PDF document text
    • http://fasebumexu.iblogger.org/mefotirizugaruwodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_601d4b3ec486d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fd63799e435d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_603d3d63e5c53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368788/normal_5fdee0409c2c4.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/lusegokaves/jeniderisofaworutuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/83755045373.pdfIn PDF document text
    • http://zapofekeba.rf.gd/game_pikachu_phien_ban_cu.pdfIn PDF document text
    • http://mipolerabafobe.epizy.com/why_globalization_is_bad_for_culture.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/6th_grade_math_test_prep.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/is_biomedical_engineering_a_good_career_in_canada.pdfIn PDF document text
    • http://musovinudebepak.epizy.com/fovopopeguzasupogumami.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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 5140 bytes
SHA-256: a90ac2b18df53aaa72d07577daa78fffeebbc675a90dfdb73549952f4b47ff93
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 12436 bytes
SHA-256: c8d1274802317a0affc90316e56f33773d7e51f4c2765e194d560a2a46a80ba3

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