Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfee2805176da8cf…

MALICIOUS

PDF

85.7 KB Created: 2021-04-29 10:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cbb536ab57db66696e0af1c859e0d5ee SHA-1: 2ee3ba88800d63a7e4ec0e7a7fffb29a4a3948bd SHA-256: bfee2805176da8cffebb59a625ebb407738165a2370c514dc50045ecdce38fff
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external links, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The document body, though partially corrupted, suggests a lure related to 'oral b toothbrush heads', which is likely a pretext to disguise the malicious intent of redirecting users to phishing or malware distribution sites.

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://pelibifir.ru/strik?utm_term=which+oral+b+toothbrush+heads+are+best PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412165/normal_60065fb159482.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/mjfW5gi/36846127437.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/VjjjdaW/canned_diced_tomatoes_with_green_peppers_and_onions.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/igEifgf/zotelitodubegorareva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_600a94a5129bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_5fd91757e3d87.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/CieKkhh/75008768731.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/how_often_do_you_clean_your_keurig_coffee_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/metumolalub/geghAM9/44626346015.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/ifWjbsp/glossy_slime_simulator_satisfying_diy_games_apk.pdfIn PDF document text
    • http://rogevunesopu.medianewsonline.com/sumilevamamub.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/couXIhb/mini_car_racing_adventure_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_605665fc950da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_600685ff881ce.pdfIn PDF document text
    • https://cdn.sqhk.co/fopajuxalaso/k3gcfii/12370840669.pdfIn PDF document text
    • http://ranomurivokav.22web.org/history_timeline_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sezijubiwu.rf.gd/iomega_storcenter_ix2-200_manual.pdfIn PDF document text
    • http://somukagokololu.rf.gd/frases_utiles_en_ingles_para_viajeros.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/dasawotipumukene.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_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 5180 bytes
SHA-256: e3950a96daba1ee3da30bc701eed02dbcf3f7e52e84667a47bd438dc65b9d5ce
font_01_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10684 bytes
SHA-256: 159b5690d850a474429baedea76255ba07b9f9381026bcb3d226adea3e6a6fc5

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