Malicious PDF — malware analysis report

Static analysis result for SHA-256 7799df4095fad556…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 14:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea22f10df58d14d925996d50cf145842 SHA-1: 1d25c5db651e8a46b2580f081b265dadd5c0a6ca SHA-256: 7799df4095fad5565004e8cedcc39d4632520ddc05d3ad39d7365377395e9dde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers 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, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hunde-katzen.at/soubory/25706854018.pdf In PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/sunasepepofuwunidos.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/sofetunatadixum.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vefarawalukebutomifedom.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/tedobixob.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/95465700384.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vikafasufa.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/vapokadegubadifikuti.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/29529880005.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/14220849474.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nifasoruxigamoweveru.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/35466644554.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/69145012243.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756949f05f---80184026102.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/5509854001.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/8624175626.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/32188210548.pdfIn PDF document text
    • https://wasael.com/userfiles/file/3328009239.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gorumetamemiwewizome.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/55452891917.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614aefea1bb5f---13053217829.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wepulunef.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/1122464204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=app+para+reiniciar+celular+androidPDF 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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 10324 bytes
SHA-256: 7140c03a0d08cfb57523578287abb1b38723c34d5cc8d17da36bd047ffa9c8d4
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 18528 bytes
SHA-256: 2a61ef3d224d30c75a62780e244268a5af85a21f96c3ccc776753f6966e9b462
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1