Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dffe99d37ec5e4f…

MALICIOUS

PDF

83.4 KB Created: 2021-03-31 18:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 946ca17fc0aabf5e75ff69ab01fda556 SHA-1: 2b194abfb0ac47405024d5b4381af82e30589937 SHA-256: 6dffe99d37ec5e4f707868acfa7c5e6f6a0782cce9bdd9d123572991d050ae19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a potential link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content. No scripts were extracted, but the presence of numerous external links suggests the primary malicious function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=mini+mental+status+test+definition
    • https://cdn.sqhk.co/suxujaba/acQWji8/air_jordan_4_retro_premium_pinnacle_snakeskin.pdf
    • https://cdn.sqhk.co/fuwufupi/DPbtgeF/phone_recorder_app_iphone.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_60502c908b6c7.pdf
    • https://cdn-cms.f-static.net/uploads/4471513/normal_601557029fd6b.pdf
    • http://fiwetud.scienceontheweb.net/jugifit.pdf
    • https://cdn.sqhk.co/bibikodazit/jhweewf/happy_wheels_space_run_3.pdf
    • https://cdn.sqhk.co/rigepasemapa/jficnTK/the_trip_to_greece_movie_itinerary.pdf
    • https://cdn-cms.f-static.net/uploads/4470231/normal_60158ae483a4f.pdf
    • https://cdn-cms.f-static.net/uploads/4445340/normal_605320a4152fa.pdf
    • https://cdn.sqhk.co/dunokufimove/fKfxidf/dependency_theory_revisited.pdf
    • http://vizenam.medianewsonline.com/garmin_nuvi_55lm_gps.pdf
    • http://zuduwamani.mypressonline.com/urbanismo_arquitectura.pdf
    • https://cdn.sqhk.co/jotapepikota/thiy6IK/93822607524.pdf
    • https://cdn.sqhk.co/disidudi/jgjhFV2/valentine_s_day_dessert_ideas_recipes.pdf
    • https://cdn.sqhk.co/temetixufuxi/igcligY/harbor_freight_pocket_hole_jig_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4416792/normal_602fc6c65e5ce.pdf
    • https://cdn.sqhk.co/botonerepap/cNAhah4/the_knight_s_tale_canterbury_tales_modern_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_c49193511dfd4e3788b57ff6b5c9b556.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_d9125c3a8a184ef3aefd002a65330ebe.pdf?index=true
    • http://mawidinivetobi.myartsonline.com/moto_g6_plus_wireless_charger.pdf
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_a5f90581b40b403ba2df8fd20a7f7ad3.pdf?index=true
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_ebab60c8d75e411c84858811e3302438.pdf?index=true
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_af0c2f5887bc453094992d5d563eee27.pdf?index=true
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_00e236a410684ac6ae28343f6a2375b4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a6c.bin
5be5b9321cde3debad957388c783b891ed7a0f315b2e732423ec5cde72bc7285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 4964 bytes
font_01_sfnt_off00011b48.bin
ad5ec00773d87ae106f596a50aef28b9cd71a2ca23fbab479fcadec169021d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 10796 bytes

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