Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6db0c6f7e8dcae4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 971c41eb28e97cf79e3378236b1b03aa SHA-1: 0e700aff408c9cf9c1aa65944e6b5ac8c670c077 SHA-256: f6db0c6f7e8dcae4f085c32aeff4bc6e060be18ee13a3f3ee5b52c68d05d6273
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to suspicious domains, likely serving as lures or part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=how+to+check+otg+support+in+android PDF link annotation
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/79446111584.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/10243748273.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/60852012794.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/54741026825.pdfIn PDF document text
    • http://mrybalko.ru/files/20048987921.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/23890429248.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/10734271469.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/38868154894.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/dizubipuzifis.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/67818901938.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zijoridekupijitosapapu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161444e1eafe78---58854653157.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/96556924555.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/95030523426.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210905_C24FD20E47BFD9E1.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/53286866743.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/17296561228.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/74123502349.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/pukumugofaf.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/gaxaromizodelubimitiso.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/68667123364.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fuzokedutixulif.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_off0000abff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 11016 bytes
SHA-256: e5efd967d94859f88f8c29436a25c9f1d2fded590a483394ad430a720d291304
font_02_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 15276 bytes
SHA-256: 8d3c68d0c579cb11b3a52e37f46e7a86cafbfd2c094bdd90f93e7dfc3600d41b

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