Malicious PDF — malware analysis report

Static analysis result for SHA-256 b139006cbaf7bd89…

MALICIOUS

PDF

69.4 KB Created: 2021-03-16 11:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e578246b94d569e0c84fad6f7af5efc SHA-1: aeda551060519c51b27ac40a1e7e3ba707eb7e3e SHA-256: b139006cbaf7bd89d2999214e5567d8344da13c9bd28c1b75938560aee3b0fa4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection flagging it as malicious. The embedded URL 'https://leonvi.ru/123?utm_term=free++opener+sound' is presented in a context suggesting it's a lure for a 'free opener sound'. No scripts were extracted, but the PDF structure and external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=free++opener+sound PDF link annotation
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/ziluwavegakemurub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_60021c546d3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fd7dc90e1f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_60160ae6952eb.pdfIn PDF document text
    • http://shop-onlain.fun/advanced_dental_biomaterialswogiw.pdfIn PDF document text
    • http://mivigodaxi.iblogger.org/riraxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5fee31582dec0.pdfIn PDF document text
    • http://vostokzapad.su/jaduduvuwoduxamotuniti1x54u.pdfIn PDF document text
    • https://ranedesipa.weebly.com/uploads/1/3/1/3/131398497/3597083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_603b4b05c4646.pdfIn PDF document text
    • https://folatidaxewurel.weebly.com/uploads/1/3/4/3/134317863/fojababafizumexipok.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/pixokexetewe.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/xamibebulosaxug/how_do_you_use_a_glucose_meter_control_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84fde18-7bae-4de2-953d-b722ddece5fc/tp-link_tl-wr841n_nd_v9.pdfIn PDF document text
    • http://ditajizuru.rf.gd/figurative_language_practice_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/chevy_traverse_2018_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d49e77-a5f3-4792-9da2-1cdcfc829097/nojidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2176d86-8d8a-46d7-943c-7ea1d7736452/gemunujosapilosa.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/78908148212.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/emt_final_exam_study_guide.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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 4668 bytes
SHA-256: 7cee97b8c789e3488ed7496e2f91c8b5638d51fa885c1a9bae280afb875b4842
font_01_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10036 bytes
SHA-256: 2cc9ccedd8a09e628ba9cca64acfe3d8184c1b775355a89ded0d61a13ce54667

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