Malicious PDF — malware analysis report

Static analysis result for SHA-256 266ed31b63c3c329…

MALICIOUS

PDF

73.6 KB Created: 2021-03-14 21:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b5e3f931dfe5390a1fd47904ef8a6d SHA-1: 2ba4ba9acde633d18fd1ed8b499dba36946f71de SHA-256: 266ed31b63c3c329c592a23ad1f0bce5b9d77ce49b9cf426c4cb3cc77c58d88a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an external URI pointing to a suspicious domain. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm, suggesting a phishing or spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=permitted+occupier+template
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fc8fd2951068.pdf
    • https://cdn-cms.f-static.net/uploads/4410989/normal_600c37257b9ab.pdf
    • http://naliputa.mywebcommunity.org/weather_lessons_for_3rd_grade.pdf
    • http://kujunat.medianewsonline.com/corey_wayne_quotes.pdf
    • http://jushq.club/wewojizimu1t4qu.pdf
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fdeb574091ef.pdf
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe0704e2bf2f.pdf
    • https://cdn-cms.f-static.net/uploads/4468812/normal_602ebc44c8216.pdf
    • https://cdn-cms.f-static.net/uploads/4380675/normal_60392fab600e8.pdf
    • http://lozhobelir.space/how_to_write_a_simple_macro_in_excel_2007o5phi.pdf
    • http://sokixatov.mywebcommunity.org/buvametakon.pdf
    • http://burrrhey.tech/palabras_con_dla_dle_dli_dlo_dlur4gz3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_96208a0ea5d24218866298709da726e4.pdf?index=true
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_2cd9d203ddeb45c78f29c82b563aae9f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7b6ff3d-00b2-4bad-a729-b2963bb810eb/72924996748.pdf
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_eb159072f5eb4d439f94d43fd61c7523.pdf?index=true
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_5c402bb6d20f4eb6b2db44467a6c6292.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_6f3a21dad95942f3aeb7cd65c0dc0f4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a0a3aa69-0763-41c5-a5d6-676a7629efa9/how_do_i_change_epson_ink_cartridge.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_off0000e488.bin
4dd8f2fc213c3a3c354a5fc9f3a7b89d858fc1ed80e0ffdabd049984cf02d282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 5040 bytes
font_01_sfnt_off0000f58f.bin
9bd224e98f8c016e24af010f65590b2db5d2bc81736c96b89e01410e1369e8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 10440 bytes

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