Malicious PDF — malware analysis report

Static analysis result for SHA-256 963b572e391137cd…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 14:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a01e382935ce5d333a030f08c9675c1 SHA-1: 829808eee97622a8f76fc09be4c1408e95f58dc2 SHA-256: 963b572e391137cd8517770e6d372202eb18f5a1a967594b1839fda73af74296
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 numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate a malicious intent to distribute further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lienlacanien.com/img_pages/file/siwipumawojupijufesufom.pdf In PDF document text
    • https://onutglen.com/caningest/images/file/9861197165.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/robelorekedamaxuli.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vavorewirikizafokoxi.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/56403131348.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/vezajatupexipewatimosa.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/45191613723.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b65ad3751---majajuvujovelepifid.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/mopapusozuvo.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/22712054956.pdfIn PDF document text
    • https://apra.pl/files/file/bujekakefatagoku.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/bofixesewawafef.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/21664466135.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab27331c0---79714043728.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/82285765668.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/55818790023.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/99164374633.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/14712662365.pdfIn PDF document text
    • http://onelove.cz/file/13234689279.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/94838623733.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/15937300955.pdfIn PDF document text
    • https://trystsalonri.com/images/file/tifitozam.pdfIn PDF document text
    • http://wuchem.com/upload/files/fegoboxanegepop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+cheat+code+appPDF 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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10512 bytes
SHA-256: 7a0a2951b7562032491330d5d3852c4034320ea6348f7cbee8d0ffffe4caa2ca
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 18752 bytes
SHA-256: 3d56e54573b761e60285ef5db88afcde55a8b98b5d982431f9fed0d7925b9bf7

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