Malicious PDF — malware analysis report

Static analysis result for SHA-256 d968b4b889d8533a…

MALICIOUS

PDF

78.8 KB Created: 2021-05-14 00:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a1b015f27ad19728e2c4ef5b77b08380 SHA-1: 41ff3c0a7a88a4c0c52967fff684a042ad748004 SHA-256: d968b4b889d8533a1f468296ebf7d67b1af170e5ecd05cc22b1c51e8a648433a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The primary malicious URL identified is https://botokaw.ru/strik, which is likely used to redirect users to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=5th+grade+science+crossword+puzzles+pdf PDF link annotation
    • https://cdn.sqhk.co/puzokopu/hijgiq9/77500771392.pdfIn PDF document text
    • http://zootime.store/nufigegubaveruwifuxf9m6g.pdfIn PDF document text
    • http://rameautbxy.space/graphic_design_price_list_templateof37i.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/CEeghFu/chicken_invaders_2_the_next_wave_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/hi2iaKB/runovixo.pdfIn PDF document text
    • http://arevakar-travel.com/43147352869ku57.pdfIn PDF document text
    • http://sabufiri.iblogger.org/jipuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec086ff1-dd3f-451c-acca-533ce40d3fcb/80685029355.pdfIn PDF document text
    • http://parolodase.epizy.com/kalomugapowazosizemewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cbf746-fb7a-4185-ba63-3038dd2f9931/romeo_and_juliet_characters_by_scene.pdfIn PDF document text
    • http://xuneviwek.epizy.com/does_costco_sell_magic_bullet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4477dc6-60ac-407d-81ca-1db94f1f362f/29151154635.pdfIn PDF document text
    • http://dawifugoxumevej.rf.gd/acts_chapter_13_bible_study_guide.pdfIn PDF document text
    • http://zoxapolusiboros.rf.gd/acrylic_color_mixing_recipes.pdfIn PDF document text
    • http://budanizuwuder.epizy.com/signos_y_sintomas_de_angina_inestable.pdfIn PDF document text
    • http://taguwepos.rf.gd/how_to_transfer_jvc_mini_dv_to_computer.pdfIn PDF document text
    • http://tepojeno.epizy.com/simefom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7fafc3-c585-4eaa-aa23-56c560292a93/super_mario_land_3_dx_rom_download.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5588 bytes
SHA-256: a4e2ca9a297a9fb5cb32c26ec7864b17b09f8866664933acf1056ea69e815d8a
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 11156 bytes
SHA-256: 50cc87b868be38a859fe7b10f746834cc25387f542010bfd726a15a6fa8e370f

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