Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af5c438ec9bb311…

MALICIOUS

PDF

74.4 KB Created: 2021-02-21 02:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 558dab986b02cc730a99539559173022 SHA-1: c1655a2296cca1239f713f492a6a8c33a97cd166 SHA-256: 7af5c438ec9bb3112a1c5a5801908eef560ec37468a945d16e9607f7f387a0ce
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically referencing 'how much is a polaroid camera worth', suggesting a lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign, likely using JavaScript for exploitation.

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/123?utm_term=how+much+is+a+polaroid+camera+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482619/normal_60257239af800.pdfIn PDF document text
    • http://recepty-dd.info/287674423104s4kh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_603194a0a08ad.pdfIn PDF document text
    • http://look-hotel.com/cambridge_ielts_11_general_training5sflk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_6008f424c15c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5ff3109aeed7a.pdfIn PDF document text
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/bejajiju_digaminarumap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426543/normal_5ff9b99ca2ebd.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/f8oLiiI/drift_hunters_madalin_stunt_cars_3.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/82ca1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6023111576619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fe2677a7790e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5ff75a9e8bfd0.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/niduxomor-nilamuruvefuzol-pewemanexukoz-sujibojebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 5368 bytes
SHA-256: 7ed1e3eca561ccdb23428dd128d296a605e79510cba97450d4c9e0ced7add45f
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10864 bytes
SHA-256: 1c5af6f1b0845d079e3a5f8cd8fa7487a6fcf59d06a227e52165b585158dbe12

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