Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ea5c231b3d459…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 17:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: deafe40158fff1f3fc4d7c87307afc6d SHA-1: edec35990817ce806f6b0521bf1102ad1618f53c SHA-256: 523ea5c231b3d459782a5a6174fddd904bdc416f6dda77359d3278834e1c245d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 hosting and are structured as link farms, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=how+to+put+a+link+in+a+text+message+android PDF link annotation
    • https://x-leather.com/radsportfiles/file/61191655375.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/31960803739.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/61849142394.pdfIn PDF document text
    • http://blueyee.com/upload/file/171915535037.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/tenidopokasi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b3cf152e3ba9510d4d15f7285c20d764/79789468902.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/xijarivewi.pdfIn PDF document text
    • http://clingac.com/d/files/59002242493.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/vezuneguvopig.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/96653411516.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/59258743342.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/53548970152.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/bezufujo.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/62141014431.pdfIn PDF document text
    • https://pellevah.com/upload/files/12975197631.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/54057632264.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/88296508521.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/69699604418.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/68293795441.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/97860627797.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16146df441a8ea---woxefepetodanol.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/lupunuvuluwevesivilezomoj.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/rovafodasejoxawa.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_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 11108 bytes
SHA-256: 82abde8094f746d4f9f626b95768ce68c793790ac91efddc193a4ca7c9cc4c38
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 17616 bytes
SHA-256: 9b7037d5e42303b9be3fe857f74dd2b571da7df9f485d1ef6a67cd455f8c7607
font_02_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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