Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0530905b4fc972…

MALICIOUS

PDF

71.5 KB Created: 2021-02-26 01:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2d2cc9c2f045a155cd0475ea2226ca8a SHA-1: 86761f2e02d8c255eeacd4975fd9619c2b406522 SHA-256: 8f0530905b4fc972cc83f2787f4887685624bd96682532632ef80e440a34eb65
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain search-related keywords, potentially as a lure.

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://jottigo.ru/strik?utm_term=how+to+write+up+independent+t-test+results+spss PDF link annotation
    • http://rukunikuxajosog.22web.org/fimekulujifogotugafubal.pdfIn PDF document text
    • http://triple-doska5.club/dragon_ball_heroes_ultimate_mission_2_3ds_rom3478e.pdfIn PDF document text
    • http://kiwikinixibiko.iblogger.org/bowivaxinizazobek.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/gM6hcvU/sneaker_art_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_6023bcb7af983.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/DTMgjia/xavirorijuvibajuvoxidoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff89acbf3f93.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/RnRhcNV/flower_time_lapse_video_download.pdfIn PDF document text
    • http://fb-ig-violation.com/928622397132neoj.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/jazi4tY/84434153822.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/sennheiser_rs_175_headphones_australia.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/why_is_my_dishwasher_not_fully_draining.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/jgevitO/download_pako_2_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_60382c011194e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukefuxatolu.epizy.com/reality_testing.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/agatha_christie_books_collection_uk.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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 4828 bytes
SHA-256: 12531b11c12ac1e92ef1b45068c4352df26982c45f3a3b58642e09523b723d2d
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 10364 bytes
SHA-256: 6f03576edcc768016fb335e38940f5407c5c75df0de8aaba7d47b4f03abd7e9c

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