Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746f7be9015b13d…

MALICIOUS

PDF

73.5 KB Created: 2021-04-01 04:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e93d81ee1a883ea540d5af09ad3df75e SHA-1: 7dacc3810a79dc65982360a09e8a3354538d7db1 SHA-256: a746f7be9015b13d4b05752d6b4f60cb38887cb3a3032871ffc6a663947cfdbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('midufefew.ru') that is flagged as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/strik?utm_term=2004+dodge+ram+1500+bed+capacity PDF link annotation
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/memipujulatibi-pomuledobodige-xiduwi.pdfIn PDF document text
    • http://sosed.market/fakosuzej364v.pdfIn PDF document text
    • http://mabobuluka.iblogger.org/61419129216.pdfIn PDF document text
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/44f20fb06720ec.pdfIn PDF document text
    • https://sitavekoked.weebly.com/uploads/1/3/5/9/135974486/ferefuxikinepo.pdfIn PDF document text
    • http://recepty-dd.info/graco_snugride_30_click_connect_expiration_datepoqda.pdfIn PDF document text
    • http://violet-cinema.ru/offroad_bike_driving_simulatorygpkk.pdfIn PDF document text
    • http://new-volosi.ru/513746537139npur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wuzakinalafivu.rf.gd/72863077884.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/algebra_1_chapter_6_study_guide_answers.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/tidal_fraser_river_fishing_report.pdfIn PDF document text
    • http://mizebud.rf.gd/who_builds_cabelas_meat_grinders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa2b192-b3d4-4353-8d98-696998ff76c4/buparimatozegixago.pdfIn PDF document text
    • http://gusepegap.rf.gd/87798143917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3bf984-1799-45c4-ae28-477fa8bfdfde/29276901890.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/38836381076.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/tesda_assessment_form_2019.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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 5552 bytes
SHA-256: 18fb231aee818caf846586150266e6dbac17a99c70cc0f07af24ae7a43ea2650
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 10848 bytes
SHA-256: 0ed187fbea3613f161d86532a63db187e5bbeea83fa9a211b128779d0d8fe8f8
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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