Malicious PDF — malware analysis report

Static analysis result for SHA-256 258b4a91875bee18…

MALICIOUS

PDF

74.7 KB Created: 2021-03-09 04:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3823bdf9a81b038b411e87bda0cfcb37 SHA-1: 210790d84088be523fb070285cf8b137a2efc3eb SHA-256: 258b4a91875bee18b6b720569163167d4138ee3182cbd27618d74c520063a706
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a keyword search term that likely serves as a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/award?keyword=algorithm+design+pdf+github PDF link annotation
    • http://my-favshopd.online/gunslinger_matt_mercer02yuy.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/uhehcjd/cake_decorating_kit_buy_nz.pdfIn PDF document text
    • http://generalmassage.online/oscar_wilde_death_hotelbhc1c.pdfIn PDF document text
    • http://seluluxafej.22web.org/xoxukupebidum.pdfIn PDF document text
    • http://japuxivofag.22web.org/33847625469.pdfIn PDF document text
    • http://hookup682.site/4839024635616s2a.pdfIn PDF document text
    • http://runolive.com/25487760292yp3l0.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/ifL9jbT/neighbor_house_scary_neighbor_survival_horror_game.pdfIn PDF document text
    • http://davofaso.22web.org/closure_property_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wakunexigoto/whgYugj/20283317360.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/Q1gixii/instagram_video_download_free_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/sjijehg/fifa_rules_penalty_kick_rebound.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumofif.rf.gd/dezuniwadigix.pdfIn PDF document text
    • http://kudikixaxalen.epizy.com/bson_format_example.pdfIn PDF document text
    • http://nurarodavokowe.epizy.com/principles_of_ecotourism_planning.pdfIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_bb407b88ae734038a331a5dd6752c64a.pdf?index=trueIn PDF document text
    • http://notalopelovawu.epizy.com/24942244687.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_0d3920b532844a81828dcbef227a6070.pdf?index=trueIn PDF document text
    • http://fabonek.rf.gd/gijulevegevagebuf.pdfIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_5e5a3718a2e643acaada7c17bf9d2b3e.pdf?index=trueIn PDF document text
    • http://kuporalegumema.epizy.com/acoustic_guitar_headstock_template.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_1ec93b52fae14ea19f54f04fd216ca08.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_8736c5b539f340fd8784a7b80a9c8001.pdf?index=trueIn PDF document text
    • http://notavopanugatog.epizy.com/11010730406.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 5376 bytes
SHA-256: afb9dcea05c6e07ec30bbfa60f05e486e39c1d42f1da952e18c0a1cb7c5acb19
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 13604 bytes
SHA-256: 557311d961959b17687d97acae554101277c874ae2bd50b0fff0e93d39fbe0ae

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