Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cb6f2452e2ea9b…

MALICIOUS

PDF

84.6 KB Created: 2021-02-25 15:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 838e3c33d7beb52684b159f9fb1b6ee5 SHA-1: a2ac8269afdc272f8d4c75d05ab8e364e0c1edb0 SHA-256: 17cb6f2452e2ea9b12eb38d81581e3290b49b64719b0ac01e39bf9ffa7b3806a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://bologen.ru/award?keyword=the+silver+way+review PDF link annotation
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/rijaxikowemewo.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/6ddiagd/xejovotigijetafuvu.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_to_use_an_arc_trainer.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/845aef03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fcaecd5955d2.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/05ed4cea41c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414868/normal_602d9840a5045.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/jbifhdU/xigovidivezatugesimox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5ffc01bdba1d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_60150e4ed6835.pdfIn PDF document text
    • https://dosoxeluniwipeg.weebly.com/uploads/1/3/3/9/133997743/9600697.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/ggfYJhg/world_war_dates_2.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/sogapamutawijibixize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://liroporuki.myartsonline.com/ropuxipepudurikuvimiwinom.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/feziro.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/tetuzemakujafevebisito.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 4468 bytes
SHA-256: 4bfe3838130d001785859176d5f811be0e6a35af7089d3f7cef2d65cbe40b8dc
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 10796 bytes
SHA-256: 7a45ec9c8dcdab01645dfc2ad425e7c1da765a188a4b9b4e62177ad10b9de3d9
font_02_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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