Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b34b1cac5f8b42d…

MALICIOUS

PDF

72.4 KB Created: 2021-04-30 15:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2426bda0de00f5504ade29be5c04517f SHA-1: ad21d211d1e61848394858c03fa62a14378e1172 SHA-256: 8b34b1cac5f8b42dc774f80c7c4722c38d8fbe6c39321f17f20c574ff7f2a32d
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, references an audiobook title, likely serving as a lure to encourage user interaction with the embedded links.

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://jacksth.ru/strik?utm_term=the+secret+destiny+of+america+audiobook
    • https://cdn.sqhk.co/sunawopi/ejhhji7/kong_extreme_goodie_bone_dog_toy.pdf
    • https://cdn.sqhk.co/firijanab/jaidhdD/wifi_analyzer_free_download_for_pc.pdf
    • http://govnosiakxws.online/blender_2.78_tutorial_for_beginnersda46m.pdf
    • http://twoup-viktoria.online/kclo4_strong_or_weak_acid_or_basejz6gq.pdf
    • http://ziwumununazofal.iblogger.org/windows_commands_not_working.pdf
    • http://fitokapss.xyz/43278450073aorx0.pdf
    • http://kipamaf.22web.org/zibafadoriwida.pdf
    • http://sibuvre.com/menulupirurim882po.pdf
    • http://filfex.ru/todazufldtx1.pdf
    • http://natbeach.space/how_to_start_dj_mixingj5cqa.pdf
    • https://cdn.sqhk.co/guwaloxipete/ibgihjI/hoppenhelm_hack_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remuv/9775569749.pdf
    • http://zenuvivasefum.epizy.com/24171046917.pdf
    • http://firixafuzive.rf.gd/adenoma_de_hipofisis_sintomas.pdf
    • http://bonizeza.epizy.com/5e_bladesinger_scag.pdf
    • http://tepuxasimu.rf.gd/95522643087.pdf
    • http://tinutun.epizy.com/g_1_residential_building_design.pdf
    • https://s3.amazonaws.com/womirofop/dowebimatuxomawiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9a.bin
9972766a555c9dbce4f1912d2615b7efaaa787d9b6ddd468ff4822f73d96682b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 5484 bytes
font_01_sfnt_off0000ef20.bin
6205ff2320b4bb841492d8523ecae082362b0ffeae4f007c6c18626deb1dd06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 10820 bytes

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