Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a9ad532ed5be4a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-04 14:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b85eb91044fc492069aeec27368daa16 SHA-1: bacdae96d5ae86c1e6e5cb28b591664d7074fbf8 SHA-256: 27a9ad532ed5be4ab657d27239a2f6a1b9485e86c599bc52b0139b42ccca235b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous external URIs, with a notable one being a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a product manual, likely intended to deceive users into visiting malicious sites for phishing or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://golowaki.ru/123?utm_term=boss+tu-+2+chromatic+pedal+tuner+manual
    • http://discount50it.pro/libililokuzotem5a29h.pdf
    • https://cdn.sqhk.co/posojuvapono/aIibF5F/assistir_videos_youtube_offline_ipad.pdf
    • http://kexumojazo.mypressonline.com/project_report_on_swot_analysis.pdf
    • http://creampiepow.club/admission_form_of_sainik_school_tilaiyaz348c.pdf
    • https://cdn.sqhk.co/josurowelimu/dpThfxI/do_u_know_facts_about_love.pdf
    • https://cdn.sqhk.co/numobelez/cjchejb/16335887225.pdf
    • http://nutristrike-shop.ru/zombie_killer_squad_mod_apk1ompx.pdf
    • https://cdn.sqhk.co/mujejadalale/chajhib/68423099415.pdf
    • https://cdn.sqhk.co/tupuxinekowa/idXnS7X/kiss_of_war_wiki.pdf
    • http://wurilozi.scienceontheweb.net/57168659813.pdf
    • https://cdn.sqhk.co/kufedefivuvu/oDFgfgd/giwumitefesozirawameperu.pdf
    • http://winoorama.website/cgp_gcse_physics_workbook_answers47rsy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_94a14d970f5f42039076a93edda031b4.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_1ad17f7ab5c0469380ffa504dccf11a9.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_372a249767694cb489b6057b029b8825.pdf?index=true
    • http://naxefugoxodikow.atwebpages.com/blue_planet_project_ita_download.pdf
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_0eb522f32afa4fb7a32f5c51768efb18.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_2a982b93fcba4bc59e333556464830ba.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e920.bin
515138b619463345a9c38991118cc9fbdbd6373806501523038b08f29b59a143
pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 5408 bytes
font_01_sfnt_off0000fb5d.bin
b71598a249edcf2f9f750cd7dc24dc2b91a6fcc185eea50bb38b5240be344353
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 11072 bytes
font_02_sfnt_off00012139.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 4324 bytes