Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a44ad54865ccd90…

MALICIOUS

PDF

69.0 KB Created: 2021-02-24 00:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: cbf9be6506e4b14de093ac3eca3d9958 SHA-1: bdcb8f3aba8fd559c5d8b2d00fb67ee04e8d71b2 SHA-256: 4a44ad54865ccd903b3a77adf857264a53ec779d029446ab5838deaaeb37a86e
244 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=when+you+wish+upon+a+star+linda+ronstadt+karaoke In PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/a19625.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/0gfibfc/lafixugi.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/gFiehct/dino_escape_dinosaur_game.pdfIn PDF document text
    • https://lobokepodis.weebly.com/uploads/1/3/1/1/131164506/gusix.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/iidI2gf/start_em_sit_em_defenses_week_5.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/f0067ac7bdc.pdfIn PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/puxozureb-zizamazisedip-siberagep-salobovijutat.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/hgmtiCE/8874715441.pdfIn PDF document text
    • https://cdn.sqhk.co/zapadenom/7DoTfhf/wijivufumomeriponiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hcmhf54/moto_actions_approach.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/zapoxuke-jixogizaka.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/Hjdehbx/6151405224.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/bhbgiad/the_curse_of_the_mushroom_king_game_walkthrough.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/vuzupadag-kigugozef-zurugedid-tamokufuxig.pdfIn PDF document text
    • http://gasorutika.iblogger.org/kekojopepob.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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5320 bytes
SHA-256: bf524aedaf99117aa6e4a27ab2722d5ef9c6818fe43c9c86668bc2e649d53bfd
font_01_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10628 bytes
SHA-256: b2f09a14548409b15431124b01c5c6b0f045370f2b525e802058c30acd9deec2

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