Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbf785ed1d8cd56…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 12:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d18d440515d4a63b7f9db42b43cdb8d SHA-1: 067098572b0744fdfc6dcd4cfe334ce2b55f274c SHA-256: cfbf785ed1d8cd5691bc4a52cd85dafe92ee9b238b2e76042a86d5c76393c003
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a network designed to manipulate search engine results or redirect users to malicious content.

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 http://tischlerei-schlusche.de/sites/default/files/file/tijogamamejezaje.pdf In PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/bujitususu.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/vegagiritifafiziwuma.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/xitujuwokuba.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-11-09-26-32-35.pdfIn PDF document text
    • https://turbooto.vn/upload/files/6399787389.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///loxusunanuwodefidokomopum.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/nasojadez.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/xigixegijubotavorip.pdfIn PDF document text
    • https://fratellifurloni.it/file/lotewe.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/71300881313.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kobezonagorixojog.pdfIn PDF document text
    • http://annabarons.com/files/files/mukafadufexuzujotexa.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/85980955571.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_170909.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tetipoliponunoluzarazariv.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b23066fc7---vodileturapefiti.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/suzizopero.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3116340f---wijagolitifaroxokux.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/govozibopibonasade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+penetration+testing+toolsPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/mapenizoxusiv.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16536 bytes
SHA-256: 8f8ac0061ff85f41972676cee1feb36f30c70ae804963c3889ca9f9a3abf427a
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10548 bytes
SHA-256: a05bf9f2900536d6f6395fe984f0237bf7c57d9ed97d59965dc7778f57050990

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