Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e911915420ea962…

MALICIOUS

PDF

77.7 KB Created: 2021-04-22 23:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c2b4a140194e2d429285010b91d96da2 SHA-1: 81d8bf3889696db83425a3ef9b1d5187d1faf5bb SHA-256: 4e911915420ea96289bcce7ed8dd1762a3e774936d30cbb3e3454d23dfdc5b2f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as an MFA or one-time-code harvesting lure. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nipisod.ru/strik?utm_term=will+there+be+the+maze+runner+4+movie PDF link annotation
    • http://mizusowe.66ghz.com/zelda_breath_of_the_wild_2d.pdfIn PDF document text
    • https://xorataseturife.weebly.com/uploads/1/3/5/3/135333409/nasagozaposakufas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_603cb78698f64.pdfIn PDF document text
    • http://gonisavuxur.iblogger.org/98216953285.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/38108134938.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/3005632271.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/7048267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_6031423a4ba26.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/gemutozixot.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/gigagisipexut_gesiwa_nitatitowo_zikekunuteno.pdfIn PDF document text
    • http://vivezotutune.iblogger.org/99307391832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_60675edfa37a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60587a8d4590a.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/kuwegefon.pdfIn PDF document text
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/mabitebubaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redepulevinevux.epizy.com/45133698818.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/apple_iphone_company_profile.pdfIn PDF document text
    • http://duziroro.myartsonline.com/bemba_to_english_word_translation.pdfIn PDF document text
    • http://joxumokuri.epizy.com/bodirogumosimajujuk.pdfIn PDF document text
    • http://dokubuxopid.rf.gd/afro_house_sample_packs_free.pdfIn PDF document text
    • http://pupekulojam.epizy.com/food_handlers_test_answers_arizona.pdfIn PDF document text
    • http://gogufujupi.rf.gd/vijulugitubo.pdfIn PDF document text
    • http://letituxis.epizy.com/gunafijerimuguzobeban.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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 5096 bytes
SHA-256: ad49f90c17671420e065b7a43a6ac1a88dcf76154770fe7107e232c241ceaff7
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 11164 bytes
SHA-256: e1e0e506600102aa0cb6c31d3bb1b1db3323a7b169f1e3135165f09f7e266047

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