Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4e7d72697972f7…

MALICIOUS

PDF

78.5 KB Created: 2021-05-06 09:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 987b60953e58878f05c75ae4edf9bfaa SHA-1: ba03852dbc01b13f95a7ae1a96bbaa4a3c033e55 SHA-256: cf4e7d72697972f70fda5dc3289effeb3d708637c246add4216748196e5634fb
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=powerflex+700+programming+cable PDF link annotation
    • https://cdn.sqhk.co/pajubopolak/r2heNSs/twisted_sister_christmas_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_5fd2252732749.pdfIn PDF document text
    • http://reduslim-shop.website/house_lease_agreement_format_in_tamile6mbq.pdfIn PDF document text
    • https://cdn.sqhk.co/dagedazi/jghaied/35976686479.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/ihhiiig/occupational_therapy_near_me_for_adults.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/xoniwovujifav-javeb-zemazagutajawe.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/B5hiRrt/la_novela_en_el_tranvia_wikipedia.pdfIn PDF document text
    • https://muzunamarufo.weebly.com/uploads/1/3/4/4/134463020/buwem-gejexakezexibi-sovekisu.pdfIn PDF document text
    • http://coloradocustomelectric.com/64836161611iu39l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375909/normal_5ffdedc739597.pdfIn PDF document text
    • https://nodudoweg.weebly.com/uploads/1/3/4/5/134599631/tegejejiwazasa_sorewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_604f39a5d624e.pdfIn PDF document text
    • https://cdn.sqhk.co/bagekaketox/Riciimm/kovitib.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/84501787871aaltz.pdfIn PDF document text
    • http://supernefritroller.xyz/pro_asp.net_mvc_5_platform_bookg0daf.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/hr5jjgc/37699367100.pdfIn PDF document text
    • http://elinekici.online/how_to_install_first_alert_smoke_and_carbon_monoxide_detector65mu7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5febf953382d1.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/36ifPib/best_online_soccer_store_usa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e97786-1571-4797-9b15-0dd8f078e8f8/42749838702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19dbbd9-1e3a-40f0-bc23-dc27dfd6a122/acer_xg270hu_review_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e73332f-5842-4c3a-beec-54a1b3fb47ec/photosynthesis_and_cellular_respiration_comparison_worksheet_amoeba_sisters.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_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 5680 bytes
SHA-256: 3f23daa2ddb731e0a349707b2f52e5d4f7c28f247f9e2abc200ca24fecf6e07b
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 11224 bytes
SHA-256: bbda32b5c9a5541fa585bd4cba22fe34c15d20de23526ee0e0c4f8bb98d6e67a