Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9721c0ee5766a84…

MALICIOUS

PDF

63.8 KB Created: 2021-02-21 19:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d30e60364bd9a0c2dfd6e3f2216b5379 SHA-1: 19dc0644ac356479a6c6868cc3d6b7d96bead302 SHA-256: e9721c0ee5766a84120ff956324f5dea3ea7b2f9b187f4f9d812c19c3c032600
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external links to other PDF documents hosted on disposable domains. The primary external URI points to a URL that appears to be part of a phishing or malware distribution scheme. No scripts were extracted, but the structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=fender+hot+rod+deluxe+limited+edition+orange PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488101/normal_602e60c9b80ad.pdfIn PDF document text
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/8957034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6014a4a68a63a.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/iffPAoM/hoops_basketball_arcade_machine.pdfIn PDF document text
    • https://tiramanab.weebly.com/uploads/1/3/1/8/131856622/gilozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5fe31caef2a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_602550349323d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409998/normal_5ff33c5e8ac9c.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/vokibomizema.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/jopotuj-xawovutere.pdfIn PDF document text
    • https://botimosiwipam.weebly.com/uploads/1/3/1/3/131398053/851d260b0bee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valapapiwusujeg.rf.gd/battery_saver_for_iphone_4s_free.pdfIn PDF document text
    • http://dajuzadufalit.epizy.com/carnatic_instrumental_music.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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 5084 bytes
SHA-256: 9c4a31f9ed1fe449515d506c8cebb603926b8b91266dd1fd836d18dd156fc514
font_01_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 10684 bytes
SHA-256: d58f783bfbf3ef76e68a283b58628bfc7f04a362020d247aeac4e0a8b46ae62e

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