Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5458dfd52a4ff87…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 13:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d4fbf222f084c04f1423d0055aa8e82 SHA-1: 741405de6a24164d3f71a90980f4c6c865379eec SHA-256: f5458dfd52a4ff87640e0e8c08d0d0354584f1f4968bea1d674e3b08a8144747
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on disposable domains, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to search keywords, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/award?keyword=particle+tracing+comsol+pdf PDF link annotation
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/nedokakupep-pubokajodi.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/iT5gchf/ark_basic_survival_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/cgdQnja/brothers_in_arms_3_hack_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/wghheja/lemmings_puzzle_adventure_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/bdcjfjf/87239625857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_6021eb9348179.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/ie7ifhj/crazy_bowl_free_shipping_code.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/eVRFjhh/pokemon_3ds_randomizer_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/BIiedda/wheelie_challenge_for_ios.pdfIn PDF document text
    • http://azorocheat5.xyz/evenflo_embrace_35_pro_infant_car_seatplwg8.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/yiisIvV/bc_boating_license_exam_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/jQd5jah/94741073856.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/5571271.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/ZiegjGf/commercial_pilot_salary_in_us.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/Rjfn3dR/ascii_text_art_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/esi9mUa/weebly_unblocked_games_earn_to_die_2.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/6927481.pdfIn PDF document text
    • http://banquepopulaire-fr.org/minecraft_pe_0.9_5_apk_download_android490vg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5ffc14360dfd3.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/jovera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 5476 bytes
SHA-256: f78e8d34ee215d83e3527c1728eced480003b735adc3a979985d0f096ef94af7
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 11284 bytes
SHA-256: 1dd56f67a866c35a7a6cf188e0ee31a5bae15baebf8ca344aebe11639dcbfebc

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