Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc756cbc704cf1cb…

MALICIOUS

PDF

72.8 KB Created: 2021-02-19 13:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 883539d3f082121500865b1ef04eb852 SHA-1: 2696bd24dddc52af84f128e23c2bbabf295d3b7a SHA-256: fc756cbc704cf1cb1edcb0c1119f40a9285b4026bab7b7f8d832ce5bce2a8ea7
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on various domains, including disposable ones. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of outbound links designed to manipulate search engine results or lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://bologen.ru/123?utm_term=what+are+the+characteristics+of+liquid
    • https://vudubigudimuw.weebly.com/uploads/1/3/4/0/134016717/703ea.pdf
    • http://mnogoturov.com/zelowefukasez7m10.pdf
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5fc80fba64276.pdf
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/jubum_banopen_sojosarobi_wuzalonovi.pdf
    • https://cdn-cms.f-static.net/uploads/4426828/normal_601982b51cb7b.pdf
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/zatokunag_rapatewake.pdf
    • https://cdn-cms.f-static.net/uploads/4452846/normal_60243efdab9b1.pdf
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/wazijoxa-makizelekutaf-wimeza-mudukuboguna.pdf
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/4172396.pdf
    • http://daimontimur.org/753518878449ar01.pdf
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/wisujavupefuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuxefefili.epizy.com/capitalismo_socialismo_e_democracia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e180.bin
917c67f1602885668aee165d637c3b54d34b94b1741b9109b1529f577ae3fda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5248 bytes
font_01_sfnt_off0000f35f.bin
3b62f618175c8cb27ee782c506326c8b434750f91fd7c02bdffcf41d432f41a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 10284 bytes

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