Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfe1b06800bf6f5…

MALICIOUS

PDF

81.3 KB Created: 2021-04-26 16:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85d04d780d941a3b0094aa08a4c0a619 SHA-1: d924a0d628e2805995e175eb2262a92080bebfb3 SHA-256: cdfe1b06800bf6f543329566a39d7e4be7c941b343857653587adddc3e036107
186 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 0.9997

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://nipisod.ru/strik?utm_term=genesis+from+genesis+to+revelation+allmusic PDF link annotation
    • https://cdn.sqhk.co/rozesivotix/fuhfzvR/brain_on_physics_box_puzzle_mod_apk.pdfIn PDF document text
    • http://dmgameplan.com/there_is_there_are_worksheetr12gw.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/cjevhbb/mix_video_player_for_pc.pdfIn PDF document text
    • http://front-glass.website/nirvana_nevermind_zip_downloadp0rj6.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/ffi7NcE/aamc_msar_2020.pdfIn PDF document text
    • http://sluzhba1.net/fojekoremakokakovarapa2zdyn.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/zofujojopapijutei6axq.pdfIn PDF document text
    • http://sodaapp.club/dirt_bike_shops_close_to_me10cqg.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/dtigDij/family_guy_the_quest_for_stuff_pc_hack.pdfIn PDF document text
    • https://zevexeduj.weebly.com/uploads/1/3/0/8/130874566/jatenuj_vaseme.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/jdgeihb/pebugobomakoje.pdfIn PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/lefaseda.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/3uhdNKT/ten_pin_bowling_league_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/hheOgha/bug_s_life_butterfly.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/lWjcEhg/xipulizuwapidudiron.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/nutanigonu/26271565208.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/how_to_make_photo_file_size_smaller_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/low_cholesterol_diet_fact_sheet.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_b1d7b94812a3406a9b5475ccd3f7a01f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/24680086051.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_f62824f3f2fe416291799a8b7e2234ea.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_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 5292 bytes
SHA-256: 06721beded45b57aadbc4219894eccb445764c8e370e8b74a94417f8133faa6d
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 11548 bytes
SHA-256: e1bcd8c55d171ccdfdc055a803e33aa3bbf9eb82abe564ac9bbd88a732ecedff