Malicious PDF — malware analysis report

Static analysis result for SHA-256 f043075b06bf493b…

MALICIOUS

PDF

82.5 KB Created: 2021-10-12 15:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5a76259915e166c127bfc7d60559f9d SHA-1: 7958b3f2f367c782acd24a5deaa5039606ca4167 SHA-256: f043075b06bf493b0d7ea96079745fbb8f7f5f18f064992468eb5bb89afcc5c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for credentials. While no scripts were directly extracted, the presence of many embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vusajofuwom.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615da149884bd---66655560959.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/95642037711.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/jewepafi.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/13320943761.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jirenakug.pdfIn PDF document text
    • http://falconltd.pl/cache/file/92630159302.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/4081337340.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/712816c6705bdb5e582cb834ba130cf0/12714133161.pdfIn PDF document text
    • http://greenld.com/userfiles/82423773074.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/42692979058.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/44408966782.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/24288715652.pdfIn PDF document text
    • https://planbmedia.hu/files/81093290459.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/zanulemitegugi.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/kewutivabide.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/daxewifobofoba.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/teregozutasibewokazitoj.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/21022244770.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210914_1B105155B8F3179A.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/vopem.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20211002_AF255AA6F67D6EF5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=need+for+accounting+pdfPDF 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10660 bytes
SHA-256: fc3efb410fe239c84d53c61c38e9ffd736ff7d3e4e72f40af8537b32a1946cd3
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 18656 bytes
SHA-256: c70538025540bea2beaf00e1810ee36c8957f3d94900cc8bf7fdd672b105c942

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