Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caa71cd6e12555f…

MALICIOUS

PDF

74.5 KB Created: 2021-04-02 07:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 38dc5c21572c2405a047f24b25d75ec4 SHA-1: eb3d8d5815173b7ecad547da44d675b4a2ef7b01 SHA-256: 8caa71cd6e12555f1363a7dc8a85c1cde8cf446399c16e854dcbb48a6fabdf33
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=admin+template+free++in+php PDF link annotation
    • http://best-ital.fun/jackson_kayak_fun_runner_70cgkde.pdfIn PDF document text
    • http://bewelaxoludiw.22web.org/31833133862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_6020fff314eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_6032e391990c6.pdfIn PDF document text
    • http://fojolosu.iblogger.org/29769390838.pdfIn PDF document text
    • http://ekzo-fruit.ru/the_absite_review_practice_questions_free_downloadmq952.pdfIn PDF document text
    • http://rubeatyshop.xyz/bose_companion_2_series_iii_multimedia_speaker_system_pc36fti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_6054d4dedc804.pdfIn PDF document text
    • http://webcam-model.online/number_of_moles_in_2nh3hxj3x.pdfIn PDF document text
    • http://teren.fun/belgian_malinois_for_sale_nchgu4i.pdfIn PDF document text
    • http://rineset.xyz/how_to_turn_on_solar_pool_heating1954r.pdfIn PDF document text
    • http://jidonuse.iblogger.org/excel_2016_edit_shortcuts.pdfIn PDF document text
    • http://muzoc.xyz/95806765893whbwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fd2cf614320f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c3a210-095d-4649-97ad-b8a88bb6d1a0/81390816775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0658520-c3c7-4a4e-86dd-608fa33ce597/dnd_monsters_handbook.pdfIn PDF document text
    • http://garapaf.epizy.com/tagayun_building_design_and_construction.pdfIn PDF document text
    • http://tokukemojitiwil.epizy.com/bharat_mata_pic.pdfIn PDF document text
    • http://nopadutotufa.epizy.com/wareditexixivewiwi.pdfIn PDF document text
    • http://zojexajori.epizy.com/23659027742.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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5092 bytes
SHA-256: ec951fff04ccff2feaa9eb6d5ca34cfda2a4922ea044abd4c8cb6b95da583340
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10960 bytes
SHA-256: c7e73e2dd57faf76bdea05351ef6fab1ace4f24f722c7ed4ca81d80045d7147d

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