Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2f0edc55118b78…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 21:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: acaaecd8c83b0586b84c9321539651ed SHA-1: 5587798c194855dd539df22f525f39311b2ccade SHA-256: 3f2f0edc55118b78165bd52489c72909902151384360a2c4f1724c772e33ced5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://bologen.ru/strik?utm_term=how+long+average+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fd2a7430d0e6.pdfIn PDF document text
    • http://milanomodaitaly.site/google_tricks_thanos_wizard_of_ozsgfdn.pdfIn PDF document text
    • http://varistop.site/kindle_fire_instructions_for_use8zhes.pdfIn PDF document text
    • http://simcars.ru/991411157235dlqa.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/cjeS6qQ/tunnel_rush_unblocked_games_77_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/9WMyORs/vezev.pdfIn PDF document text
    • http://genusadnlo.space/is_logic_a_good_daw39krc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_602ae028de8a8.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/fhii7ib/zaxemodigaxixasuvubonisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499636/normal_6019163cd7372.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/hfgeVgg/292709185.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/41579530669tzc4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/benuka/how_to_setup_garage_door_opener_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/12107813831.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_fe5f7f96d5b54196a5c5a1602405ff0a.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_48f05be78c224d218a9718296e884f10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/charmed_season_1_episode_8.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/64747121810.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/76889347383.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_5e44259da39f4fdbb25586f2993c0ad9.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_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 4992 bytes
SHA-256: 7a2fc530ed5e02ca4f30ae5b1d82a0fd2011733ab222b58df84af858aa44f7bf
font_01_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 11596 bytes
SHA-256: 34d786531db3b8c7305bf3be4a26484663e6a173c993d1e5e6cbcfab224a9e13