Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3997535679805a4…

MALICIOUS

PDF

109.6 KB Created: 2021-03-29 04:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23a57a7c224b30b8d880b461e7e60d3f SHA-1: 21b44ec6ffadea42e4709333e8d1a806394a112d SHA-256: e3997535679805a49e42bb6d4befb6d93477365cbe70373a98999c50b69b245e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=defence+xp+osrs+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413007/normal_60091d111e0b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_60002a681f2ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_606058c46670d.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/fVAgjrg/sample_eia_report_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6054528f0c9cc.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/l5Bhaie/las_vegas_athletic_club_cancel_membership.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/f3FQgji/24859395437.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/meigFkS/university_of_montana_tuition_waiver.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/sears_kenmore_dishwasher_repair_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/sghjjih/home_design_stay_here_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_11bcdd471ec74c03b4b4d63ae7eb4dc7.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_b07bf9575def45438938449203141700.pdf?index=trueIn PDF document text
    • http://kiwizenodemi.epizy.com/what_is_the_importance_of_mass_media_in_the_society.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_cca25f46d2bc402d9c320d981d0f1965.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_ec61052ab2df467e816a775e84183e62.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_333e2f42b2bb4ecbaf01bde7d7c87299.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_3d060e9e694a4b3fb5ab362b57ffcfd6.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_4e32816396e54e368943ae44ae527822.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_c6d20f67c3a34a5185c3cd5e49579e07.pdf?index=trueIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_f647eae04bd54d6ea3efcc5cc83edf3b.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_d1fa3a10de6e4d15b719eaad8cde8fe0.pdf?index=trueIn 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_off000170db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DB 5148 bytes
SHA-256: 1265d4a32190f129bb438fe577f2062b2de0d1e68f37ffbb63370a47cf05ccf6
font_01_sfnt_off00018281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18281 11484 bytes
SHA-256: 3574e042ff6ec0c3cdab66142ce822a9356a35fea7368fa72c71e888643d9d78