Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9b2bf05875e320…

MALICIOUS

PDF

91.2 KB Created: 2021-03-17 03:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f90abd515da76d9124eb4f94fc6c409 SHA-1: dcf393786cb2c163f5b5e3998423086d77cf5efb SHA-256: 8f9b2bf05875e320de98e023f49c607e3587d5f71f1365d19579f51957453a02
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=unblocked+mp3+downloads
    • https://cdn.sqhk.co/futevanu/gehgijx/cricket_bowling_basics_for_beginners.pdf
    • http://potenciy.xyz/8382707543431qw8.pdf
    • http://ital-girl.space/82437327580853u9.pdf
    • http://pasetbs.xyz/87377519439983yb.pdf
    • http://prizinsta.site/jilakevumivexowaxubivobyo8i.pdf
    • http://jofufunobek.sportsontheweb.net/hp_photosmart_d110_wireless_setup.pdf
    • https://cdn.sqhk.co/goganededem/6ijgdif/lucky_draw_application.pdf
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fd3855a7bb9a.pdf
    • https://cdn-cms.f-static.net/uploads/4444386/normal_602406ce98270.pdf
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5fe75a8d581b1.pdf
    • http://jolidulikan.scienceontheweb.net/xutafe.pdf
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/vibefisu_durisibasufa_simox.pdf
    • https://bapizemu.weebly.com/uploads/1/3/1/1/131163962/338b79e47cc1.pdf
    • http://roboludawu.mywebcommunity.org/how_do_you_solve_a_2x2_rubiks_cube_in_two_moves.pdf
    • http://linodogeb.scienceontheweb.net/economic_and_social_issues_notes_for_rbi_grade_b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9a7db865-8266-4a20-95e9-e456d2ba16da/94197660958.pdf
    • https://uploads.strikinglycdn.com/files/2cf386ff-3e44-48a7-8e5c-4cb031c08d66/jandy_valve_actuator_adjustment.pdf
    • 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_off00011988.bin
fe37cbdc0ef299104e337c88cd2fdd6bbec3f5b6699516b5acf4bf0f8fbeecd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 5232 bytes
font_01_sfnt_off00012b3d.bin
182978c03fdfedf234bd97b1ac47c1c79272e75c79eb57a59006f1b1c6ddc3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 11436 bytes
font_02_sfnt_off00015222.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 4324 bytes

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