Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fb6e9e59c2f6f6…

MALICIOUS

PDF

69.8 KB Created: 2021-02-20 07:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b9e3aaffa076cbf6445989811852565 SHA-1: 60048411c85c3ce75b1eb374797e937454350ceb SHA-256: 81fb6e9e59c2f6f68521bee9adcc1666f398e47bbb04ec1ae2016f118db6bbf0
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 an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO manipulation tactic. The primary URL observed is https://seumenha.ru/wix?keyword=prof+mark+harrison, which likely serves as an entry point to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=prof+mark+harrison PDF link annotation
    • https://cdn.sqhk.co/ligumorik/ijhZgh1/matejatagi.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/990d51.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/gotimanalojiral-tudopu-pakabebemo.pdfIn PDF document text
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/3449133.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/2157867.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/wizarizor.pdfIn PDF document text
    • http://docita.fun/avengers_endgame_4k_movie_for_freedgxhv.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/9483149.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/ixfqgVK/stickman_warriors_online_epic_war_mod_apk.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/2962569.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/sesabit.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/09f712f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379362/normal_5ff5d208b3762.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/hhargcT/the_trial_of_the_chicago_7_review_guardian.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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 5040 bytes
SHA-256: 829e27512ae18821a263e241efe157b5e62600b4d284515bfb064bc31e441337
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10784 bytes
SHA-256: 634ae4ac37c8fe014977ca2e630ff4d0d6a3d47bbd467bc42fb6bf23e7d9c0b9

Open this report in the interactive analyzer, or submit your own file for analysis.