Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c50d826e5e6c3…

MALICIOUS

PDF

73.0 KB Created: 2021-03-11 16:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec7e683953cb4eee3e536a1b1feb3459 SHA-1: 73a28e8a08890ffe2c6f3ea722e048adadf24cf4 SHA-256: 6c9c50d826e5e6c3b6f2d97ff14c3cf6393249d9c229fddf50c73540b1321c56
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 domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=physiotherapy+neurological+assessment+of+stroke+patient+pdf
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5ff29118909c4.pdf
    • http://ighelperscenter.com/37239894179p1zu.pdf
    • https://cdn.sqhk.co/mibajufaneja/Jhahejb/dents_de_lait_qui_tombent_ordre.pdf
    • http://bamefidev.mygamesonline.org/understanding_virtue_ethics.pdf
    • https://cdn-cms.f-static.net/uploads/4489409/normal_60276d822f79c.pdf
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fee29611babb.pdf
    • http://hookup157.online/woxub3t5m4.pdf
    • http://taxevidel.medianewsonline.com/54926292858.pdf
    • http://zegikofabubevel.iblogger.org/ms_excel_assignments_for_practice.pdf
    • https://cdn.sqhk.co/letaziseb/aTNvckh/98170914165.pdf
    • https://cdn.sqhk.co/dujovibipu/jgeTifV/movawiruxu.pdf
    • https://cdn.sqhk.co/fesakesovoka/5fviaja/the_crossing_chinese_movie_2018.pdf
    • https://cdn-cms.f-static.net/uploads/4443362/normal_602ebabc2b9ff.pdf
    • https://cdn-cms.f-static.net/uploads/4384149/normal_60333aff7ae69.pdf
    • https://static.s123-cdn-static.com/uploads/4491686/normal_6008ce7103934.pdf
    • http://reawolt.online/toastmasters_international_competent_leadership_manualsczhk.pdf
    • http://ludesajezopaju.medianewsonline.com/banking_service_chronicle_march_2020.pdf
    • http://vulemese.iblogger.org/lifewexese.pdf
    • http://juvovagesubo.mywebcommunity.org/mukhya_sevika_merit_list_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wenimawibi.epizy.com/sewuso.pdf
    • http://worazuwimitital.epizy.com/6251635233.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_off0000e06d.bin
c18d0bc121fbe8e1450a53deae8907689088fe0c48502e611d49076907e4a639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 5736 bytes
font_01_sfnt_off0000f3d8.bin
d9cc520d71e83e6bfd832e48dd811ad7b9a00d3b35d3f7d307398fba5732c2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10052 bytes

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