Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bad373efb676b4…

MALICIOUS

PDF

79.3 KB Created: 2021-02-20 05:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d6230bc595399594df9b6f1abb123781 SHA-1: bc4fc6404d7ca3d1ba498e4541674682578d4a3c SHA-256: 26bad373efb676b49c330111af1507053f9a4cdef26ef58e13d4a70ed0c20fc0
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/wix?keyword=lafayette+high+school PDF link annotation
    • https://cdn.sqhk.co/bipukawu/UqbN6kN/game_sweet_crossing_snake_io_mod_apk.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/dijuwaxavud_kizugej_zoponoliz.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/vufaxiwomejab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_602fbba406abd.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/zevukezalidokubenes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392651/normal_5fce9e49d3239.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/i5c37sA/kofivo.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/jfjf3KK/world_war_2_history_books_best.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/lokorerasun-waxusutimamu-sigutu-zopeb.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/8673494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403557/normal_5fe569bb0daa8.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/RRhdihZ/25311146796.pdfIn PDF document text
    • https://cdn.sqhk.co/ralofobo/Rirhdic/single_gunshot_sound_effect_free_download.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/pogolo/gorebejo.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/mevidas.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/methanol_to_formic_acid_equation.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/5433241350.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_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 5092 bytes
SHA-256: 3adbf0dc395bc15b9e7c9bd47ce5ce321fe03803ab1de296810765b55519f7fc
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 10572 bytes
SHA-256: 0aa116e25be4899e04fba0ee32a4fba43106722fab45e241b1f066cd20938bb6

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