Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca1efe2da6261a3…

MALICIOUS

PDF

111.6 KB Created: 2021-02-27 23:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 65e89083b6b53ea2abe248f564e2efa6 SHA-1: 45a9c3215f164c384dddfbda273e28e772804e5d SHA-256: cca1efe2da6261a3964b4d6104f48de02749383f9573f40d85a10584e8aede20
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://seumenha.ru/aws?utm_term=what+kind+of+paintball+guns+are+used+in+community PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6020398954651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd60bcdd57fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_602d81e055fa6.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/negunivek.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/7687770.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/xerozufadiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601a80c48bd8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5ffc5935489cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_603551cd966ed.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/07181dc47899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_60095c073d6d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_601b828ed3c3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5fcdcea5498ed.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/kisimujuk/b._sc_2018_exam_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/nurevirofogowidukinemuju.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/how_to_calculate_leave_sell_back_navy.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/rujosabekekes.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/tokexex.pdfIn PDF document text
    • http://divifafapinuk.rf.gd/balance_druid_pvp_guide_3._3._5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC9 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0001750b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750B 5888 bytes
SHA-256: e6eedee2f56cb13cc34ed56528057129e4b0577ce8ac727659af43d1e33230d9
font_02_sfnt_off000188fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188FE 11376 bytes
SHA-256: fb989d6de588c40db5442e839a37e43e502eec3f352207bfa5c80094755748d3

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