Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f875a8a17fa4bef…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 20:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa48f61ffd0d857aba3b50e70e10bf48 SHA-1: 17d944b3abe1a9c56d284efaeea257b8b4b4970f SHA-256: 6f875a8a17fa4bef07e12e1acb653bc75f789295b153e69c835bcbb92c9de1c9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including external URIs and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. No scripts were extracted, but the presence of numerous suspicious URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://coimbrasoftware.hu/images/uploads/files/mapomijufapiwot.pdf In PDF document text
    • http://mp-journal.com/media/file/rerape.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/44963206037.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210907155719.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/75078249522.pdfIn PDF document text
    • http://salt17.com/userfiles/files/25325962379.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/12303685178.pdfIn PDF document text
    • http://usateatop.com/_upload/files/94316834150.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/kajuxuxajani.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/92503245345.pdfIn PDF document text
    • https://eventaipei.com/upload/files/73568831317.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/97083798792.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8a34741eac8c07e734188cfc224b272a/57076591441.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/fivufabasat.pdfPDF link annotation
    • http://h04ydivan.ru/userfiles/file/gevilexosowimenivaxapola.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/3023938388.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe825c038c---nojudimipamulafus.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xofopofuladop.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kawaluwekapenuxabedebogek.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/18674704829.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/70051485856.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/23902649132.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jekuvedevejodas.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/sefes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hk+tv+show+apkPDF link annotation
    • 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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 21084 bytes
SHA-256: c855b4687e0c5badc06cf389feea8f3fb4c6eefe64474ba2679bb4303bf662c1
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 10112 bytes
SHA-256: bd5e5b92a096432af1929118526381518f700891a3a15b01787a48312bf631fc
font_02_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1