Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab31ef9b53e1b0f…

MALICIOUS

PDF

81.8 KB Created: 2021-04-26 15:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 90f117175bd4b1c97d9933230dcd4f5b SHA-1: 03903b595b5930da43b09edeecbdd9d30507d85e SHA-256: 4ab31ef9b53e1b0f8135c6d1aa502708aed47de50dd7748de7cd2a8389ae8a05
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'T-Mobile personal cellspot setup', which serves as a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/strik?utm_term=how+to+setup+t+mobile+personal+cellspot PDF link annotation
    • http://tiktoktop.design/16153884863ok5a4.pdfIn PDF document text
    • http://milansit.space/schwinn_s350_electric_scooter_owners_manualedcug.pdfIn PDF document text
    • http://terugate.mypressonline.com/gejasopikolamom.pdfIn PDF document text
    • http://fortuneo-enligne.com/jafasubpm7y8.pdfIn PDF document text
    • http://indir-kazan.com/sobreviviendo_a_pablo_escobar_capitulo_7r9jb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_603f37aabca89.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/vovoxurajinefugima.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/80910368694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_606776544c4c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ffba42d73bc0.pdfIn PDF document text
    • http://drenajkrasnodar.ru/best_bosch_300_series_dishwasherp1mtc.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/79497411383.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/julupe.pdfIn PDF document text
    • http://kelnoteres.xyz/pikapalewutobijiwaodegf.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/it_project_manager_interview_questions_and_answers.pdfIn PDF document text
    • http://redpandarecycling.com/68388622837iwbqf.pdfIn PDF document text
    • http://smartcoin.design/army_drill_and_ceremony_questionsettfm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380079/normal_5fee193305fda.pdfIn PDF document text
    • http://retamos.mygamesonline.org/75986595573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5fda00afbe0b1.pdfIn PDF document text
    • http://baugroup.info/jajixudifebaluwupiguvemvueqa.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/kegowimobewufidodukuw.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/fevobelijogal/76215828231.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/credit_score_chart_by_age.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/wubuwevefaluvowepotoneke.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_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 5272 bytes
SHA-256: 7e4d94ab8770d213cb296ebd4ca17a61ffa386a225d092fd11993eab8ffaa26f
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 11108 bytes
SHA-256: 7f9988c34cf57c264b3133810e6986365c13ca3963e6a4f46f4f54fcb79f831c

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