Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fce9d924b531275…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 07:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c6d41b24c87553cedece77260e3471b4 SHA-1: d5814d7512e3b247de1634fb960791e141bcc162 SHA-256: 4fce9d924b53127509f0f0bc2f1135069cfb86f8d933198d5367a939375c2575
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and the overall structure suggest the document is designed to redirect users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=eliminator+ant+flea+and+tick+killer+plus+outdoor PDF link annotation
    • http://pozijuza.scienceontheweb.net/bedtime_stories_for_toddlers_podcast.pdfIn PDF document text
    • http://peuer.xyz/dr._andreas_moritz_liver_and_gallbladder_flushq4qpc.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/wijorawidoxe.pdfIn PDF document text
    • http://zhigina.ru/autisme_montreal_formationyd7by.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/e26jagd/judosalijitixer.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/HtnrRhd/acute_respiratory_distress_syndrome_guidelines.pdfIn PDF document text
    • http://nerroba.info/john_rawls_justice_as_fairness_a_restatement_summaryhossg.pdfIn PDF document text
    • http://finansi-7.online/switch_steal_unwrap_gift_exchangesvsig.pdfIn PDF document text
    • https://cdn.sqhk.co/tusujoxaseru/gchejgr/latex_template_ieee.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/CooDCig/dinosaur_party_jumper_rentals.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/1899108668.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/ihiibgp/natural_coffin_nails_designs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekerudosepu.rf.gd/time_travelers_wife_book_quotes.pdfIn PDF document text
    • http://senusekavopodu.rf.gd/samsung_beep_once_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/half_ironman_training_plan_16_weeks.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/39786270980.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/20990420099.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/torelobodupilusisuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/fisazidozupumoberek.pdfIn PDF document text
    • http://kodogama.epizy.com/96642653314.pdfIn PDF document text
    • http://funuduki.rf.gd/suwazituj.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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5324 bytes
SHA-256: 6f1426a21acc48180508f0f84cec0fc2fd0938448a3fef056a0bf36cddfd5e99
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 11240 bytes
SHA-256: 52c714d17dd4cf91441d9a0a78d93e45add808e8c66fe7712dcf144354763df9

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