Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ac0df4f503024a…

MALICIOUS

PDF

76.9 KB Created: 2021-02-23 18:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 38a4427c8b0aeda071c479488062bc95 SHA-1: dcdb6a4922e6c61a007b5f2d2b6522279944d97e SHA-256: 20ac0df4f503024ab881e8841a8b8ae7eb9d5fc5a637aabfa0348d3eb2c781c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=blank+world+map+continents+and+oceans+pdf PDF link annotation
    • http://idealsit.fun/trillion_dollar_coach_accompanyinglne67.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/z9vmKjf/dragon_quest_9_vocation_base_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/QhdNzib/83469018002.pdfIn PDF document text
    • http://agentsoft.space/ruzapodubufozejobutbskf.pdfIn PDF document text
    • http://allfreebets.ru/jidelozose0ss95.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/hjhaNge/16895037770.pdfIn PDF document text
    • http://dsv-trening.ru/81662187401rpimq.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/figlP5W/cooking_ice_cream_malayalam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5ff8f47a6c777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_60334c78a1418.pdfIn PDF document text
    • http://moviesaddaa.online/yeomanry_cavalry_uniformshvijm.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hihgejb/super_dancer_chapter_3_audition_full_episode_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_5feaf7904564b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fd1e589d2a55.pdfIn PDF document text
    • http://reduslim-shop.website/java_jre_64_bit_freew67nf.pdfIn PDF document text
    • http://about-central.com/kagugivabererifakidatababqbr9p.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/g7zjeij/pocket_stables_hack_apk.pdfIn PDF document text
    • http://tradebot.space/86548440593ue3ge.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/gjdjaid/52807626003.pdfIn PDF document text
    • http://arm-watch1.club/32280512834olez8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467589/normal_5fcccc4fe795a.pdfIn PDF document text
    • http://getsalon.xyz/immunization_refusal_form_ontario5nkvv.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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 5504 bytes
SHA-256: 1f378a57c273f9bff120466655378036a04f1bcadd0e26ce501eb6fe764ba39d
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 10592 bytes
SHA-256: d4828fd932a2c5a1274c757522a2e19fd79a0341ade989ed48e2c821f17b8c39

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