Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8748c25cb6e33bd…

MALICIOUS

PDF

77.1 KB Created: 2021-03-26 05:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a09e3fb08677ed3eaeb9dd78b409cbaf SHA-1: dedf2ac88ff761c4aef320187aa768721c6ad244 SHA-256: c8748c25cb6e33bd1ceb56b0a84c7db4453755b76c8b11032e09c50c02e15bea
166 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to redirect the user to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://dafemum.ru/strik?utm_term=how+to+start+writing+synopsis
    • http://xawinagolagiju.iblogger.org/building_information_modeling_software_list.pdf
    • http://profmaster74.ru/research_methodology_in_educational_leadership_and_management8e39o.pdf
    • http://requiremcgood.com/bible_theology_books_in_tamilezqao.pdf
    • http://ropukejak.22web.org/basic_soccer_skills_for_5_year_olds.pdf
    • http://wemirepijamo.iblogger.org/cetoacidosis_diabetica_que_es.pdf
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5fca0e27885d3.pdf
    • http://gamonigujubi.22web.org/jurnal_akuntansi_pemerintahan.pdf
    • http://bupro.asia/bowie_knife_design_templatekareo.pdf
    • https://cdn-cms.f-static.net/uploads/4501775/normal_6049cccdaecb6.pdf
    • http://segwaywheelchair.ru/54140178297myihz.pdf
    • https://cdn-cms.f-static.net/uploads/4368478/normal_6057d169e6a73.pdf
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff23ea977509.pdf
    • http://superheatbelt.xyz/30877954783gpq6x.pdf
    • http://xewosaxebojufir.iblogger.org/monk_character_sheet_5e.pdf
    • http://bepevekebezupu.22web.org/wexekuna.pdf
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ff22a9a9cc6e.pdf
    • http://tivazaluweze.iblogger.org/parental_stressor_scale_nicu_questionnaire.pdf
    • https://static.s123-cdn-static.com/uploads/4387060/normal_5fe1ca9317ea4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kuzoxutinilidog.rf.gd/is_there_a_harry_potter_8_movie.pdf
    • http://katakamubu.rf.gd/how_do_wifi_security_cameras_work.pdf
    • http://watuvul.epizy.com/absentismo_laboral_libros.pdf
    • http://jefebewo.epizy.com/bal_hanuman_video_hd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin
69564995c58ba58ffdab9dcb7ee78e72dd095c4dae8c36acb4c28ca7dc6eb79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 4780 bytes
font_01_sfnt_off0000f46f.bin
bf7bd08bb01502be66f8feccba3f20a0b3d505a137492e01213d6a9772c35b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10784 bytes
font_02_sfnt_off0001190b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 4324 bytes

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