Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c6772ec1c4e5a0…

MALICIOUS

PDF

85.3 KB Created: 2021-02-26 19:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dccc0b98b3def91c09dc5ff3b98edeaa SHA-1: 884756e3a701b1ab18622269dcae04e52d838cca SHA-256: 14c6772ec1c4e5a069e81a20a28249a243d554ad8008b7815c67f19dde842728
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are presented as search results or downloadable PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of seemingly benign ones.

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 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://golowaki.ru/wb?keyword=easy%20piano%20songs%20with%20letters%20christmas PDF link annotation
    • https://cdn.sqhk.co/pinepopowig/jj1FhdP/meteors_fireballs_asteroids.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/85075932853.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/izYPs8R/digital_marketing_program_manager_salary.pdfIn PDF document text
    • http://fusitekive.iblogger.org/36130091578.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/dibujo_de_cara_de_nio_para_pintar.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/ibuHjgT/toxubogurolabenewabimuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_600121197104a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_6002ef6fbca3d.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/lhgSGjg/anime_paint_by_numbers_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_600f3e3435c6d.pdfIn PDF document text
    • http://putededojijubo.iblogger.org/69861470721.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/j2jgjbo/mamudutogeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_60292c3a3bb73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusewijoje.epizy.com/zakonudipuresonuxilusar.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/baxusabusidugavuvuzegofo.pdfIn PDF document text
    • http://pejulok.epizy.com/lopenirufedumugudupimet.pdfIn PDF document text
    • http://rebubokinore.epizy.com/mutir.pdfIn PDF document text
    • http://tavixemurivadol.rf.gd/how_do_you_factory_reset_a_dell_venue_8_pro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 2968 bytes
SHA-256: c1dbbb5a2f743dc09031bb3ec8e14ab5de3a51c2e7015f82c6ee96811df5b5e8
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 5496 bytes
SHA-256: 28fddf4054a04d4c9b7182e747d8bf3f27464f95f01eb0b97d81a3255aed2900
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 11052 bytes
SHA-256: 25a3a27605335b66b48922453c420c4784236c8581751820f2f92338c49143c2

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