Malicious PDF — malware analysis report

Static analysis result for SHA-256 0804364e9acb2588…

MALICIOUS

PDF

72.9 KB Created: 2021-03-03 14:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 609133feecf3253e32998ac278be4200 SHA-1: be3998eb1c27204048c1fa27d570555c1630a989 SHA-256: 0804364e9acb2588456368dcbe639c257cae99e77596521de2316ac7acccae1f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that lead to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

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://gimoguvi.ru/award?keyword=the+visible+hand+study PDF link annotation
    • https://cdn.sqhk.co/wifukatar/ghQhcjb/best_blade_irons_golf.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/jurebigusixuk_ninoxe.pdfIn PDF document text
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/2402775.pdfIn PDF document text
    • http://fesilax.22web.org/74014918414.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/8ee4dbf09.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/ghalYid/2967774958.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/epgjjjJ/76313395011.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/pubotiv_guguxoko_xalivataru_bidurore.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/traducir_textos_del_espaol_al_ingles_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/clasificacin_de_los_nmeros_reales_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/vikuketetavapapukowipaful.pdfIn PDF document text
    • http://mawokale.myartsonline.com/can_i_take_the_notary_exam_online_in_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/taguwosuzosejixabalanobo.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/contour_maps_worksheet_high_school.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5068 bytes
SHA-256: f1c1accfa135f950b16047bf41b616295a193c62bb58f65b41b72142a143d77a
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10360 bytes
SHA-256: f5c59c2ad77c7569b178657c7904dd4bff15fe23b128a6d40648bd133c491559

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