Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26d8fadec4c6df5…

MALICIOUS

PDF

102.7 KB Created: 2021-03-09 23:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fbb66fadb389d8f8ec223d1930bd052a SHA-1: b4fc1f1025f47e71152e28fbebb6e88bf53fdb11 SHA-256: b26d8fadec4c6df519c21e901a9e59458ea466dea8bee0be79aa01cf22e9fbc8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URIs, with one prominent URL being https://ponafet.ru/123?utm_term=jack+in+the+box+menu+nutrition+guide. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates that the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=jack+in+the+box+menu+nutrition+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497346/normal_60353dc3eecaa.pdfIn PDF document text
    • http://fowatufilomit.iblogger.org/york_yvwa_chiller_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fc71b10c782e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_603366b829346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_603171d01a50d.pdfIn PDF document text
    • http://voirlo.xyz/weather_worksheets_for_kindergarten_printable5jmbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_60161b25a1609.pdfIn PDF document text
    • http://jezituwevusefaf.iblogger.org/messenger_software_for_pc_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6017b61af1298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_5fd980c9427a3.pdfIn PDF document text
    • http://nudistoff.club/34576633365exwew.pdfIn PDF document text
    • http://tells.fun/giant_tissue_paper_flowers_template03ff0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovifuxabobi.epizy.com/classifying_chemical_reactions_worksheet_section_6._1.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/28467372961.pdfIn PDF document text
    • http://dagimasara.epizy.com/pefafu.pdfIn PDF document text
    • http://jotirejubano.epizy.com/4_pics_1_word_level_2341_answer.pdfIn PDF document text
    • http://xajetifenej.epizy.com/tu_eres_frankie_ruiz_mp3_download.pdfIn PDF document text
    • http://sabuxixu.epizy.com/12944010686.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/tabilep.pdfIn PDF document text
    • http://zolivowubek.epizy.com/xuwebapikux.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_off0001551c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551C 5404 bytes
SHA-256: fbefd1cbd8a8dfdee2f9483cb5c2aac03d82ed2436d4a94edb9cf61760cabafb
font_01_sfnt_off00016755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16755 11308 bytes
SHA-256: 930f1036866dd0c7872934b8f35cbfae4b8a289048cb9a071730dab95607c3cb

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