Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c105b324db9dff…

MALICIOUS

PDF

71.9 KB Created: 2021-03-25 17:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fc28f521d3ad92717d0a2039889f7613 SHA-1: 2d101776cd541cb80a824823b2bf2789e7f6980d SHA-256: e9c105b324db9dff98e7edba47eaaea5bec44a9f81afe2688d60e760880fe1b3
186 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple external URLs, including one pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=coleman+5000+watt+generator+spark+plug PDF link annotation
    • http://tadosuzewamu.medianewsonline.com/animales_del_mar_para_colorear.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/34652861781.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/76073660500.pdfIn PDF document text
    • http://nojigopagapusu.mygamesonline.org/south_africa_tourist_map.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/posodijididal_narigagugetipi_giteraberikaz.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/tozuzufob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_5cde26eee4d94eca8c95caa616e02ef3.pdf?index=trueIn PDF document text
    • http://sajatuvireguta.atwebpages.com/70768690198.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/formation_professionnelle_chambre_de_commerce_lyon.pdfIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_28ffdef99c094d8fb08a05c9446e8386.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_c2f6708479e946b78a1d8c73b3d3c0c8.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_c8e241afb89f4eff98940bad296e074d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/a_speakers_guidebook_6th_edition_ebook.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/44578644790.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/abs_home_workout_apk.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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 5468 bytes
SHA-256: 430b80fafd7d9c988d9d07e89c20593272ab10140883c5907aebce97e469a2fe
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10612 bytes
SHA-256: 1bd5ac3425fe07cfc6963468e8f1fda7a89d96ffa9de5724a565c208f32f753c

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