Malicious PDF — malware analysis report

Static analysis result for SHA-256 496588806932f67a…

MALICIOUS

PDF

171.6 KB Created: 2021-06-09 07:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cb0732b01409a35002deadd9cc8b0eab SHA-1: c91f728b8d49ed0f97b2ec26575ae6050c1693bb SHA-256: 496588806932f67a36fedfeee684f10eaca14f5b9b7a298d6ce458e9d2bef55a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a prominent one pointing to 'xajibur.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

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://xajibur.ru/123?utm_term=clevedon+school+uniform+news PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365620/normal_60442244d3f56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411714/normal_5fc93686cea57.pdfIn PDF document text
    • https://kexuminuki.weebly.com/uploads/1/3/4/3/134310960/lapasosizepoka-sedopupajusiga-zujovojuwokug-sewak.pdfIn PDF document text
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/numunadojeboseb.pdfIn PDF document text
    • https://rowenimurowa.weebly.com/uploads/1/3/4/5/134501525/e3d1789566.pdfIn PDF document text
    • https://kijagixizob.weebly.com/uploads/1/3/3/9/133997709/8685530.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481173/normal_60aff132def4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_60559bf94edaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5ffa726c9abfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulazojab.pbworks.com/f/94629216699.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144437370/printable_calendar_may_2021.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/40684454957.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/how_do_you_get_more_refund_tokens_in_league.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/f/tawaditifuwiwawutelanodet.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/does_jbl_own_harman_kardon.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144446580/tubidy_mp3_mzik_indirme_program_indir_cretsiz.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144710259/oj_microline_floor_thermostat_instructions.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144517968/47214069664.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/surah_yaseen_arabic_text_file.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/communicating_in_business_english_free_download.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_off000262b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262B2 5108 bytes
SHA-256: 121217e54c9c63c7c7bfaea2c642d5cb6299413871950b7167db177742ad8a36
font_01_sfnt_off000273fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273FD 13056 bytes
SHA-256: fbe4166a321ca1c1490ed30986174da16864af7a2594680e4355dd0115697f49

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