Malicious PDF — malware analysis report

Static analysis result for SHA-256 368fa73764fbf793…

MALICIOUS

PDF

83.2 KB Created: 2021-02-15 05:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1adca36a6ebbda221bbde585dfa680f0 SHA-1: bc917e9eced7db4d0b716c92813023fe3d1acf28 SHA-256: 368fa73764fbf7930830560a72e5572d2257a6257cd1a864adfabb6f30f0da04
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

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://jacksth.ru/wix?keyword=callado+o+cayado+como+es PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388842/normal_60130267ea79a.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/cctv_system_installation_guided05rm.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/michi4F/good_costume_ideas_for_guys_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/hguIjel/birds_of_prey_pop_vinyl_list.pdfIn PDF document text
    • http://boothattendant.com/whatsapp_profile_picturenlcm4.pdfIn PDF document text
    • http://nikaold.site/scrabble_word_finder_game_free_download60mvy.pdfIn PDF document text
    • http://allostar.buzz/98282468712xpa8t.pdfIn PDF document text
    • http://moitender.org/sceptre_32_inch_tv_standvpe3f.pdfIn PDF document text
    • http://cyberlife.store/anti-_hijacking_cbt_answers74e42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5ffb985e28f71.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/a7hhkjg/pedak.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/gehcJjd/rezunubad.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/ihiajb6/23825352756.pdfIn PDF document text
    • http://bbflowers.net/31919100837yorp8.pdfIn PDF document text
    • http://busivel.xyz/kekatisokozizfqrna.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/Fgdw7ge/modern_age_comics_algonquin.pdfIn PDF document text
    • http://covid-19online.site/wilurixisejamap531h6.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuziwi/hcYjhFj/jetevivosagekuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_5ffe2538af14b.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_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 4996 bytes
SHA-256: 1cf170c96a7ead880828ea10adda165095c8382d345451f85894f7c8e4ba6ba3
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 11648 bytes
SHA-256: 249ca85715309cdd944a10349ccf60ea835ab8a9c3217454641a1837fe1a7d57

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