Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89689659045910b…

MALICIOUS

PDF

77.8 KB Created: 2021-05-01 02:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e4979b469e89fdcd639cb57ec8e138d6 SHA-1: 509f4a9c45e64efd8d4fdb18b040121ebda9b298 SHA-256: f89689659045910b671f43369428d488f03f392d679e1ed374d8da9c538fb921
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous external URIs pointing to disposable hosting, suggesting a link farm or SEO spamming operation. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=is+taco+bell+the+healthiest+fast+food PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd787833f6fe.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/89379947864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_602c35910b863.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/iAsifhi/3762519347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_60595228efefc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_601de75e29022.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/58A7DHV/46521148175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5ffb311793355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fe125f38ce1d.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/sequence_of_tenses_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_600a43d0052e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_600ea6b23a2d5.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/BjjQxk4/28903496445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_600e2515c8271.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/gSgcFnT/divorce_decree_template_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_60646da69accd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fccb4f113d80.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/quote_from_the_little_prince_about_stars.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/padadutiseni/osrs_fletching_money_making_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/dafafobazoladage.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/liponutorur.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5092 bytes
SHA-256: ce980fadd642a13b27bad766df4e893f7e0ddad0035225299b5844a5f27df781
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10708 bytes
SHA-256: 7822e454e0561a00f3ee1ca7df9edef01a6943ef6d94995ccd6087c6bb215025

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