Malicious PDF — malware analysis report

Static analysis result for SHA-256 0509b6fefa306b01…

MALICIOUS

PDF

80.0 KB Created: 2021-03-27 10:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05aadd272bf5e9774adc2a0c4a3bede1 SHA-1: bd8c593e3aead7db80e8bc0f9acbc3eac99825a0 SHA-256: 0509b6fefa306b010209e0e51dd1b67b6f3f372716a3288e440a2c4995d95e42
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to guitar chords and the wkhtmltopdf application, likely serving as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=major+guitar+chords+chart+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478422/normal_602bfdf9e8150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5feb754fd85d0.pdfIn PDF document text
    • https://fosubenasodu.weebly.com/uploads/1/3/4/0/134097760/topubexojemaz.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/jubalilexuzolikogi.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jjhdLvj/napajowogaxopimufipuzo.pdfIn PDF document text
    • http://cleanup-sale.site/1994_honda_accord_ex_tire_sizeg3yuo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_605330036f65f.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/6395589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5ff362006dd18.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/pejugiwuso_xatudagofarevaf_luzotagepinuzaw.pdfIn PDF document text
    • http://itmax.info/fuvoxuraxmwoj.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/jcxDaw0/nomopanukevatatuzixu.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/e5sigjc/consolidated_theater_showtimes.pdfIn PDF document text
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/malodilumi.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/NcgePeU/halloween_costume_ideas_for_men_with_beards.pdfIn PDF document text
    • https://betunujaxub.weebly.com/uploads/1/3/1/6/131636576/vosowikimiju-lalipikewobaren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwerodewepejij.epizy.com/makaxoxokewokojelita.pdfIn PDF document text
    • http://fosekor.epizy.com/xetixarazamifijivotuzova.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/albert_camus_the_plague_free.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_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 5468 bytes
SHA-256: 0326c91106f887f75908807b8b50e2e0f7ac732d7343f24ab2046bffa6cb6016
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 11120 bytes
SHA-256: 8025407b37ac6d32c04b3a4215b2cde93d245a385699e95b6aa8deaadf763dd6

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