Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7d131a5c5a4018…

MALICIOUS

PDF

101.3 KB Created: 2021-09-14 15:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 543da8933a1b9e48bdf7ab0d369982f1 SHA-1: a760d708d4efd934e3727548196d15469b9c1dee SHA-256: 7f7d131a5c5a4018a380f146cecb9d344353f649a996618c2813394480cbd369
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 external URIs, many of which point to PDF files on disposable or low-reputation domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or conducting phishing attacks.

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 https://queure.ru/uplcv?utm_term=external+text+features PDF link annotation
    • https://iqmuseum.mn/uploads/files/vixex.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/21643367528.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/22314619586.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913054428.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/31517441376.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/46372787634.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133ede28ad2f---wekizakonetegutupotik.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/27223166821.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/ninubovixujesokasap.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/68803958445.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/76391557187.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/rusiwasota.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091021491153.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/jekuxenedisinuzujip.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/16352963709.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/pudak.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/74449023432.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc323265e---20908447177.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/63794094049.pdfIn PDF document text
    • http://wwsm-us.com/files/file/86723909289.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/jimewutojapevibitor.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_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 17620 bytes
SHA-256: 06f6658e3c94cdf2efaa723bb03fa030df83a3ed312d66747fda7a8f72d442fc
font_01_sfnt_off000158a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B7 10180 bytes
SHA-256: e9d430b21213c4f1cef25a43505837a87a61c0f2828911a28e6c2050216ce32a

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