Malicious PDF — malware analysis report

Static analysis result for SHA-256 426a5c4aa11fa316…

MALICIOUS

PDF

78.2 KB Created: 2021-02-28 17:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 08aff0511278728ce90d2bb9f3e8fda4 SHA-1: fc19b40f7faea20c36b0ba0994ff100ecfcd8b7c SHA-256: 426a5c4aa11fa3160ef9702eb72223695310030923e7ff97f1e842f7f7ff2ab3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content, likely involving JavaScript execution within the PDF viewer.

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://gimoguvi.ru/strik?utm_term=twilight+eclipse+book+and+movie+differences PDF link annotation
    • https://cdn.sqhk.co/rojarimeg/2VghVic/download_green_the_planet_2_mod_apk.pdfIn PDF document text
    • http://tur8osale.site/youtube_mp4_dizi_indird4g06.pdfIn PDF document text
    • http://usesoda.pro/dell_optiplex_9020_sff_i7-47904p2ag.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/teperexibizowovakubo.pdfIn PDF document text
    • http://ecoservice-vlad.ru/24374292677c6ob2.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/862570ac3.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/Rih4yig/houseparty_play_games_on_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fe63dd3c139d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5fc8a4b09f0b7.pdfIn PDF document text
    • http://mgacessoria.online/8521896482223tsu.pdfIn PDF document text
    • https://cdn.sqhk.co/biwezabob/SQklQ5k/vesigusexevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_603af05e71d18.pdfIn PDF document text
    • http://forsage.pw/149834516470kafp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fc8738b1aa87.pdfIn PDF document text
    • https://pudagabofozeru.weebly.com/uploads/1/3/4/3/134333597/2bf533.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/hiDvijk/how_to_safely_clean_road_rash.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemigososefof.atwebpages.com/34397928319.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_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 5872 bytes
SHA-256: 28ccbef6a790cab1fff557617eb9d149798147c48972469ba487d5f4ffc0d03f
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11580 bytes
SHA-256: 1cadaa4aa2b60a7a9b45cb3e9123a43707363063e36f06ed32a843dd853ad47f

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