Malicious PDF — malware analysis report

Static analysis result for SHA-256 239abf1dbb0d0e04…

MALICIOUS

PDF

110.1 KB Created: 2021-03-03 19:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d433215bb870ebf7e742a567fab159dc SHA-1: 96a6941ad8a049a9328737f52d2e889c41e88468 SHA-256: 239abf1dbb0d0e046f6027219637729aa0ac1f42645c81f715c8fe6fc0fa2060
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious 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://leonvi.ru/strik?utm_term=resumen+del+capitulo+1+de+genesis+de+la+biblia PDF link annotation
    • http://cccckkkkkdd.space/kavokike84rx3.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/what_is_the_boy_scout_oath_and_law.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/ggS0hhL/tasks_notes_for_ms_exchange_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fe9ea52bfb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_601aa1c7a6ebf.pdfIn PDF document text
    • http://uscarins.info/minn_kota_ulterra_112_60_for_sale20irc.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/jkhiggE/38156570203.pdfIn PDF document text
    • http://iuts.space/51489427121ks93w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_603dafdf4d231.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/Nhbgihe/rales.pdfIn PDF document text
    • http://7lessons.space/98947639515hsqfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386595/normal_5ff40ee1a276a.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/baduxaparunivonuradezuxok.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/hgQhc3K/17472794905.pdfIn PDF document text
    • http://appless.space/award_ceremony_programs_templates0oim7.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/73999087962.pdfIn PDF document text
    • http://glawerry.online/callapp_premium_apk_free26coa.pdfIn PDF document text
    • http://card2card.live/num_lock_caps_lock_indicator6z5rw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwuwijagabote.myartsonline.com/what_is_the_amount_of_ending_inventory_assuming_the_fifo_cost_flow_method.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_off0001707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707C 5496 bytes
SHA-256: 4f63b3b89b34a3081ea380affa0b77ba295119633b8bc85c1b8dff4ff7cfceda
font_01_sfnt_off00018322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18322 11560 bytes
SHA-256: 2780ab98239c72fac64b29a925cfbbbeb57eb88c7dcf35a581a6acbac76a6e0d

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