Malicious PDF — malware analysis report

Static analysis result for SHA-256 243bf28ea813d818…

MALICIOUS

PDF

80.7 KB Created: 2021-04-02 13:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 46ddea7e8b5869a59933494a4a3dd5ba SHA-1: c0b2106fa6a1f5d8a27d603324b3015751c50f95 SHA-256: 243bf28ea813d8188c5b2393898fed3842171c14d3136fd902a79c6cfc76a761
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/award?keyword=aristotle+poetics+chapter+1+pdf PDF link annotation
    • https://cdn.sqhk.co/sixitigoxeto/h9bUhDA/keworebexovos.pdfIn PDF document text
    • http://insurancesouk.com/bibliography_entries_mla_formatn4uf7.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/budget_2020_highlights_pib.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/btichd1/zedowanebixo.pdfIn PDF document text
    • http://jejarit.iblogger.org/agario_zoom_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/operational_amplifier_circuits_design_and_application.pdfIn PDF document text
    • http://skameyki.club/186315990409hipa.pdfIn PDF document text
    • http://grinallex.shop/fefinelovutevejuzomogjhk16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_605ca1ea328d4.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/tekuvorebujejin.pdfIn PDF document text
    • http://zofugef.mypressonline.com/la_botica_de_la_abuela_gratis.pdfIn PDF document text
    • http://bufo.online/27843268119ok5zr.pdfIn PDF document text
    • https://cdn.sqhk.co/pawexedibib/qo78gcr/vobija.pdfIn PDF document text
    • http://kdghy.online/fimokihm6ag.pdfIn PDF document text
    • http://pushbiz.fun/ps_gold_wireless_headset_instructionsyl508.pdfIn PDF document text
    • http://nebo-baikala.ru/would_you_rather_questions_for_gamers88ip6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_605326b767d61.pdfIn PDF document text
    • https://cdn.sqhk.co/gizetinediz/if6V1jh/75078703440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipidomi.rf.gd/lagu_op_blend_s_versi_dangdut.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/32302715304.pdfIn PDF document text
    • http://janepalefudu.epizy.com/11520009843.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/biltong_dryer_diy.pdfIn 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_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 5284 bytes
SHA-256: 30c0e26e8c5da670a4b7abe30503910295101ebba30453b67c701fc3871fd1ca
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10924 bytes
SHA-256: 03d48389c97f921fb75b384a12ef9ca84278e803a418750ee0202ca4e7a0207a

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