Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b10c48e1b603bc8…

MALICIOUS

PDF

86.7 KB Created: 2021-04-01 02:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 58b9d1d1937e2aceb7d2de0e26853e0a SHA-1: 224f33db547f995646c9d684f196626ab77a07f5 SHA-256: 5b10c48e1b603bc8b4729223d0a2fba94ac58f7317269eafb760197d604449b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=cdp+protocol+pdf PDF link annotation
    • https://cdn.sqhk.co/xagaxubibiz/hcMifjj/download_sonic_dash_2_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/iahewBK/47534823635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5fe6c785333aa.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/final_fantasy_7_complete_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_603262a4b6396.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/UijHCgd/55172833401.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/linksys_router_ea4500_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kataregulu/eVEAWdJ/xobupojusi.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/aidKEgh/65127418145.pdfIn PDF document text
    • http://tujozavido.66ghz.com/b_e_o_full_form_in_kannada.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/hhiihhd/30383605547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzulipanaro.epizy.com/51142968344.pdfIn PDF document text
    • http://mefowoweman.epizy.com/jorafepokexixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4710ff50-43c0-4b7e-9b97-9662f3b5ae04/78298609675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d7655f-b85a-4816-a066-fe592c9faf45/teaching_students_with_special_needs_in_inclusive_settings.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 4664 bytes
SHA-256: 1577b97262efe60cffc77fa8166c288d8a5994285adfd78d7601e8b188254800
font_01_sfnt_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 11220 bytes
SHA-256: edf1c9a192dc2fd8b5c41d12a6ad1eaa294f8efeb7e73759d94ec1edda9eb6d0

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