Malicious PDF — malware analysis report

Static analysis result for SHA-256 a099c3120e39cfc3…

MALICIOUS

PDF

88.8 KB Created: 2021-05-08 11:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 18f183d28e277120c9ae550e2fe2425d SHA-1: 208e490ebec42fc610b17f97881a8fa13548c9fd SHA-256: a099c3120e39cfc318d0b7b5785da9d414c2d509a2dec09cfcbc7de8d9ce91fb
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 designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of techniques used to lure users to malicious sites.

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://jumiwimov.ru/strik?utm_term=dewalt+gold+ferrous+drill+bits+vs+black+oxide PDF link annotation
    • https://gokidobizivoji.weebly.com/uploads/1/3/4/4/134495246/jikeduposanufagugi.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/sotizepeliper-demamoluloxo.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/1592387.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/the_book_thief_full_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_60328e11639b8.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/3e5043717bf01c0.pdfIn PDF document text
    • http://alteramaks.world/chemistry_solved_question_papers_with_answersnaddm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5fed23e8e1224.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/62262720415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5ffd75cc1da4a.pdfIn PDF document text
    • http://prechambre.xyz/does_altered_carbon_follow_the_books15utw.pdfIn PDF document text
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/4136801.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefabe/96175534270.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_f3d53a0f8aa84b7481fd54fa4b6f35d2.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_9acc996f65464a94bd3c71a41aa48eae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/62046869372.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_700083c8aaf145b1aaa66adc99e9011e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/gudademaxokifa.pdfIn PDF document text
    • http://jutagejefutix.atwebpages.com/xarakemapidixixutojed.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/mufikorewo.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_81f23cbb6fe44f3ca24ab148a1ea69cc.pdf?index=trueIn 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_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 5612 bytes
SHA-256: f8401eb1a151c4ef5e4429e4085efb716ca5c131c212a866f77ab0683aca838f
font_01_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 11628 bytes
SHA-256: 27973519f1ca8adc510701bc9bf8659423b625fc1672dcb60aff8fc4c0b22cef