Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdf72603614e2bf…

MALICIOUS

PDF

79.8 KB Created: 2021-05-21 22:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66ac9077a93a3655c4054c8a132f7aee SHA-1: 510c6bfd83346ed2ba7818511d8c76431132d45c SHA-256: cfdf72603614e2bf68b877a20c0099a479077b895b122c0c1321e3e335866d0a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a PDF URI pointing to 'ponafet.ru/strik' suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery. The PDF also contains a link farm, further supporting its use in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=calculer+l%2527intensit%25C3%25A9+de+la+pesanteur+sur+terre+et+sur+mars PDF link annotation
    • https://kalakibujupe.weebly.com/uploads/1/3/0/7/130740073/311c6c87902.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/dutokojosaxewuvagor.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/wogujutamim.pdfIn PDF document text
    • https://finowizefi.weebly.com/uploads/1/3/1/3/131383614/momed.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/fadadedezeker/28076245480.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/winiminu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/15432203953.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/implementing_domain-_driven_design_free.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/new_telugu_movies_free_sites_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/aptoide_tv_3._2._5_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/acute_pulmonary_edema.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/tupuxojaxateke.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/proofreading_worksheets_with_answers_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/demetrios_trophy_guide_and_roadmap.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/4454754494.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/rpg_maker_vx_ace_games.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/49781131505.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/amrish_puri_dialogues.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/8911696970.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/zomadibonudogot.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/21146374993.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/boxemurixemivepisena.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_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 5300 bytes
SHA-256: fa90bd0347b562281e91a614d995a36216d9e405fe9061d4342ebc14d4990d2b
font_01_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 12224 bytes
SHA-256: 5df35d062f13b438929359469b73e4fff932c843539052797397b2f18f1caf2a

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