Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bbe7bc3ce6ab8c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-12 12:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a3f44e3f741984cd873a9a42a4b6d94 SHA-1: 29b96665ef278e74e6681ece449d0ce1a76461b3 SHA-256: 68bbe7bc3ce6ab8ccc722336b7ea8ff847b6b7a32a6eb3207f41b53c4a6013ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, many of which are disguised as search results for popular media, suggesting a phishing or content-luring scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.tobywells.org/media/fckdir/file/zenatab.pdf In PDF document text
    • http://zatoodesign.com/userfiles/files/94181403833.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/7825919431.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/xugetukofogo.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/82072338694.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/55021393749.pdfIn PDF document text
    • https://zagi.hr/files/37747971499.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210909_214845.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/12132258958.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/xuvenok.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/ravigonozedigizojokedeg.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/selonukutepitibenozi.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/49590845088.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/81181813851.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/14621647301.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/gidikobipenerorufiko.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/43959647497.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/43825127244.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/legogo.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/givefavanit.pdfIn PDF document text
    • http://generaldistco.com/images/file/tejabiderawupamexiva.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/60700569141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=despicable+me+2+full+movie+freePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/50200956696.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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 10868 bytes
SHA-256: 6f6f5898765e826dfc4d4f488a94fbc585079df1981ede1a8f03e1090c8c5e72
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 17228 bytes
SHA-256: d7f95627f6f41a02ea6abb937b99ce653f35982da25d30760082f2d312e6e777

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