Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1ffa4541f748df…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 08:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e780150e25d67101d7837dd7825eab0d SHA-1: a79b05c1ba1fd19722929e922783c58a385f6137 SHA-256: 5c1ffa4541f748df0f2a72ef04297785f6b04fd6777a7c505e512c81586e313e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/wix?keyword=vtmb+modding+guide PDF link annotation
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/nuxozunametumixagiku.pdfIn PDF document text
    • http://expo-kit.ru/oklahoma_prentice_hall_world_history_the_modern_era_answersok954.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/jFAjigc/inside_out_lyrics.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/ligeia_edgar_allan_poeriyti.pdfIn PDF document text
    • https://lososegumupabi.weebly.com/uploads/1/3/1/4/131407698/6427170.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/saburibewosapuxima.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/fd112.pdfIn PDF document text
    • http://ayazshabutdinov.club/31783011680zhpg0.pdfIn PDF document text
    • http://reduslim-shop.website/govukivnui0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6009cd6e68789.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/xm5iijb/rival_stars_horse_racing.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/8207468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374368/normal_5fc61120d5df3.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/pubiwegu-gisanofegavokor-wijujija.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/bjfJihj/subway_princess_runner_online_plonga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_6031ba274d706.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/ZZcX9p4/zugepufujupetudimi.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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 4736 bytes
SHA-256: ac1fef7746df9c767fbfde1e0e5b5b7ee0ff5c55189482887a8e93258bf655af
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 10348 bytes
SHA-256: df2ac679a4702a257b3155f59be377d282af58add8846f31ba5cd2ffea515525

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