Malicious PDF — malware analysis report

Static analysis result for SHA-256 b910750126af5291…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecf4befed19f3ff714878baa50f06867 SHA-1: 87dec06d801b60895dc9cbb3a6fa3a2d0a013323 SHA-256: b910750126af52911a93b79b537a9334b4d03b78027733f6054e15f5cf9d9c25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=fisiologia+del+intestino+delgado+pdf PDF link annotation
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/simodob.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/jukisakizezajodipuna.pdfIn PDF document text
    • https://2acontractor.it/images/file/mapesifuzil.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wikigunovobusobakezonitem.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/muxadebudekurururez.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210906/file/73085892042.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/napebafidinulekopiba.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jekoxodifegod.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/fonosifuwitosuveze.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t3jl3f5goagro3hcjoma25ek9l/niniv.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/5440880300.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/25243454980.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/nebafilatixivetipolovuz.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/64278205130.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/saronekifutogudege.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/togijuviratizigiwor.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/62867911982.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/masenekurujafadubi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/rekekimekuwufozifuzoxi.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zuxijodina.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/obdrhttq2kclof0lllr19g7fn3/ginadukavitujizuselaxilo.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/65103573742.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/5131220648.pdfIn PDF document text
    • https://el-tall.pl/pics/file/65570914206.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/20762975356.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 15112 bytes
SHA-256: b528e13e96cc932934169b5877604a73ecb9968d5195b5c7bfc59dbdfb1d325d
font_01_sfnt_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 10548 bytes
SHA-256: feedcc4ac302479bd93fad7c198b96c1fa2ea65cdfb519240bb16dac7eb1c67f
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1