Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4a1998af00799b…

MALICIOUS

PDF

86.2 KB Created: 2021-02-08 12:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 113b4248606ab8c5a52e584ad65453da SHA-1: 9555241ca4de60e3f69a43e807661ab344779a97 SHA-256: 2c4a1998af00799b5a1839b0a2d86df406246961adfced2cfc5f8e1b21b3ed1f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs strongly suggest this document is part of a link farm operation. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or distributing further malware.

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://bologen.ru/123?utm_term=rationale+for+each+question PDF link annotation
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/nuxebofaga.pdfIn PDF document text
    • http://erogan24.website/46136688290yb7b0.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/5677374.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/403fba1.pdfIn PDF document text
    • http://reduslim-officialsite.site/grade_2_gamesgrl2m.pdfIn PDF document text
    • https://peromukagitogim.weebly.com/uploads/1/3/1/3/131383820/gadamulu.pdfIn PDF document text
    • http://on24-system.club/telenovela_a_madrastra_capitulo_603h3sv.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/dujosor.pdfIn PDF document text
    • http://sozefavi.22web.org/72867049799.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/4113323.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/xixokaze.pdfIn PDF document text
    • http://vinorama.fun/programming_arduino_uno_in_pure_clgb3b.pdfIn PDF document text
    • http://20970907.net/zobamixugimutuvoa63bk.pdfIn PDF document text
    • http://bridgecommerce.com/92707074984uyj63.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/eaf94634f4788.pdfIn PDF document text
    • http://dimax.website/allen_bradley_powerflex_525_manual14qhu.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/dekisoxisumubobi.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/guwipidirot.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/c7b884c1d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvidetalenaras.epizy.com/86669252254.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_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 5104 bytes
SHA-256: 73b3cfef93b903bbc355a94d7cb83d8d96ef6bbafc18c4b21c19f4e7ffbeda46
font_01_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 11048 bytes
SHA-256: ce017991459f729cbd8fecea9a79ecb6682c3281da6338603a4cca6f94acdb8b

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