Malicious PDF — malware analysis report

Static analysis result for SHA-256 2388efb59b622546…

MALICIOUS

PDF

71.7 KB Created: 2021-03-05 12:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8d3051c446bf82ee3be16ac5fff4b68 SHA-1: 297ce1d877f61f5f15701c52cc7ad8f04b4d1497 SHA-256: 2388efb59b6225464a23cc29da022df16fb83dd8c2ae2e6249ff3d609c7874ef
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://dugedepap.ru/wix?keyword=impact+360+desktop+applications PDF link annotation
    • https://cdn.sqhk.co/walekikem/gWLnjgW/super_dancer_chapter_4.pdfIn PDF document text
    • http://design-kvartira.info/zufibuseze1t2kp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424646/normal_5fcf7f4d7d858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5fe9222939198.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/gggjehi/31379869095.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/GVpidje/wrc_the_official_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/a21KLjc/gb_whatsapp_wallpaper_library.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/iEgcgf1/3446685464.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/jgjbhbv/jukarimabutisufirepobixo.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/jaLqhac/i_wish_perfect_english_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/ShjD8Aq/best_buy_downtown_brooklyn_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_6003806e70aec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_600063f7366dc.pdfIn PDF document text
    • http://blacktea.space/36602897445cq0ok.pdfIn PDF document text
    • http://onenature.space/320170651884dq84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_602b35ea9e56d.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/Kgijbjc/star_trek_fleet_command_wiki_dilithium_mine_locations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_d1512d6dd50a40c9b82f7728b24746be.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_cd99fc296519491786036f56844d22b8.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_0d6006dd5b5d4d999dbbf5276ccdfe24.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_9d74f1dc4382483497f8f40a226e48d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/beab841b-770d-4e8f-aa87-e7365a614a75/dell_inspiron_one_2320_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e53fda-72d7-4809-9c73-4e66d8da4e4a/twilight_saga_free_download_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c9b236-92d5-4ac7-83ae-bf85fadddffb/redafedemumugajetibirebej.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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 5584 bytes
SHA-256: 96006f66574e292cccdf04b4fd5dc01dfbdb332e50b0897cd086b2f3e386bd47
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 9960 bytes
SHA-256: ef71d0516df2bcc61051e67a40025c33159016fc374d3bc6f7084af98893d1c8