Malicious PDF — malware analysis report

Static analysis result for SHA-256 f969643732acaae0…

MALICIOUS

PDF

68.2 KB Created: 2021-03-02 18:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 63268716631442663081cd4a1214ce96 SHA-1: 222100435877ecd1cf2e49069f613553e17e56f6 SHA-256: f969643732acaae00a62a14f7da2a3811ba476cafba23148056643f29c6ed480
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://dugedepap.ru/strik?utm_term=how+to+use+conair+1875+styler', indicates a potential phishing or malware distribution lure. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=how+to+use+conair+1875+styler PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527237/normal_6035421504220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd63ff592404.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/4d094782.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jAKggii/natagijise.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_to_study_for_ochem_2.pdfIn PDF document text
    • https://wefakibulebu.weebly.com/uploads/1/3/1/4/131408371/nojaxifuw.pdfIn PDF document text
    • https://kutikeso.weebly.com/uploads/1/3/4/4/134490414/daladarajemiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fd3073276848.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/iHCjhCp/utah_national_parks_road_trip_planner.pdfIn PDF document text
    • https://navesurupuseg.weebly.com/uploads/1/3/3/9/133997449/3936125.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/kU7IhgS/55475828243.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/cBTigii/26443507469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fcad6d040f67.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/geronimo_stilton_saison_1_episode_2.pdfIn PDF document text
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/jubapakogi.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_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 5396 bytes
SHA-256: 17f9471c107cb2b0585bfeb44b415e6b15c19bae26d115c057fc09e1467bd5d6
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10888 bytes
SHA-256: 07d4fd9b4b7158dcb00bf1c6e76856467392330e01d35341d76dc58f17538512

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