Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf3944bbb73d6b4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 04:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48e8b95201ab2bb77a9ba5fb99ccc4f2 SHA-1: b7aa5948f8e5843798135e6ce9a81257e22764ec SHA-256: 8cf3944bbb73d6b42ab561bb711b1e5d3eacbb01307bbff1849e9931559ddad4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to external sites, many of which are structured as file download links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=gta+san+andreas+pc+mod+apk PDF link annotation
    • http://termosystem.pl/userfiles/file/kemifikinolurebufe.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/sejetuvebojapugodaxazetif.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/palejijuwosatiraje.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613a8abf630af.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d3070781---nefinoxonutelimeka.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/60615071505.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/32656047559.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109050832229033.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/88208213715.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906210317.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/89059897587.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/31875932369.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/65944379236.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904040725.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/95826240408.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/tibawizojubevigurajutagen.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/96290797081.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1b029efd7266db5c6052ca5e54a0fc74/rewerati.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/dutivofateriti.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/bikubexojewufedawefabek.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/xumexu.pdfIn PDF document text
    • http://mimpishio.com/contents/files/88380673505.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/belixoxedemida.pdfIn PDF document text
    • http://evola.it/userfiles/files/zedudebabunin.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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 17356 bytes
SHA-256: 1061dc54ab5066992e886a98d10e9cdf017f577e09e23129579f777debd648c6
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 10668 bytes
SHA-256: 930f54f37e3dbac3ac9d1d7a052f5a30af76ec72d47e4c516828b47fbb372749
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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