Malicious PDF — malware analysis report

Static analysis result for SHA-256 54363b266dd623c4…

MALICIOUS

PDF

95.6 KB Created: 2021-04-05 17:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca667c463217828265745a34f0b030b SHA-1: ceb4da24e61c3cd93aa5e3ee26c6f71879fc030d SHA-256: 54363b266dd623c42e5e27e299c36d3932e2879d996ccd3812b41f964eca7006
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request to entice users to click the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/strik?utm_term=how+to+schedule+an+appointment+at+the+dmv+for+id
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/zavuvajomidonidojap.pdf
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/litavigupufe-jufakabune.pdf
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/pepagadoposefaz.pdf
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/6f1ecce6333ef7.pdf
    • https://static.s123-cdn-static.com/uploads/4462065/normal_5ff01ee36fabb.pdf
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/dovotururuvujikeg.pdf
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/jutedamev-bubeduluj-jilinakaxixebil.pdf
    • https://dugixezixek.weebly.com/uploads/1/3/4/3/134344389/8439d.pdf
    • http://it50off.pro/keylab_61_mk2_manualrr3r1.pdf
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/nitijatitovo-zejapen-pitetitagix-xelugire.pdf
    • http://beremoter.online/dofamorekelull97by.pdf
    • http://xonubevobupok.iblogger.org/free_music_player_for_windows_10.pdf
    • https://cdn-cms.f-static.net/uploads/4449410/normal_6050d70fdef1a.pdf
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/b8806f84f962e56.pdf
    • http://clubstore.pro/gewosajifaditalen7fpoi.pdf
    • http://hopecommunitynaz.com/49463601442eixgi.pdf
    • http://banaziwe.iblogger.org/61015147146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/96901331-4d13-4974-a6f7-75f5e725add4/what_is_a_xpress_redi_set_go.pdf
    • https://uploads.strikinglycdn.com/files/12823bd5-61f0-45e7-b2d9-942833a8b588/81362050431.pdf
    • https://uploads.strikinglycdn.com/files/e989c6c2-1a9d-445b-8ae1-8dd1bdc50339/average_income_for_emergency_medicine_physician.pdf
    • https://uploads.strikinglycdn.com/files/b6370099-f0e6-4e55-aff0-299a4004725e/how_do_you_do_a_neuro_emotional_technique_on_yourself.pdf
    • http://foripoj.epizy.com/45670060368.pdf
    • https://uploads.strikinglycdn.com/files/a4aeb4d7-bb1d-477b-a3b4-3c4e41166744/maxevuwedunafepatuki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013904.bin
a22f63faa96ed5f96af6d70da55a3c1bdc083a0f8bfaff1394cc0d7b2d40c05e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 5508 bytes
font_01_sfnt_off00014bb1.bin
b665687cd8b3a456a8c55e8aecb91136912a29f33634f1e2eed2eb5aebe089e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB1 10896 bytes

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