Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab2440044208be4…

MALICIOUS

PDF

84.9 KB Created: 2021-02-26 17:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ae2a96431cb78ed9dd4665bd64ce4f16 SHA-1: dc664433fce9c5826d288cccb93936c72b09e3e1 SHA-256: 5ab2440044208be4330f108835d4ae9deee7cb727a0e516f1ba033c2669bd577
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains references to 'washing machine maintenance service' and 'wkhtmltopdf', suggesting a lure to a malicious site. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=washing+machine+maintenance+service PDF link annotation
    • http://fekevopimibun.sportsontheweb.net/32761122143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5fec0663624c8.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/fidonilivufivabivek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458132/normal_600362ee9adf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_6015b46669e89.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/craftsman_garage_opener_replace_battery.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/telibifolojazofuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_602798653fa6d.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/4485875.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/b7b69af131988f6.pdfIn PDF document text
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/4834261.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/puludedaxotogodovokov.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/db4ea1ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6014cd16c1e01.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/xozobazolowotabaxenu.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/xirebirukego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/binesi.pdfIn PDF document text
    • http://bitines.myartsonline.com/40308573633.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/fapipenuk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 5256 bytes
SHA-256: 74cccf761ebb8720a4516efd7359660f0ecd7797e895ae0838c487bedc687b6c
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 10728 bytes
SHA-256: 7bb2839f2b522781495bef917309e63a0081a2ae0daaa203624634f64604d72a
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f

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