Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cd25fea000c45c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 03:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08df4100241f3b256000767eb70fb770 SHA-1: 1534cb69279be1c498fc91050dbd4a6f5a1dc3eb SHA-256: 40cd25fea000c45cda7a8086a7fe78bf284104b71d44ce7e6da47a536f1b374b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also functions as a link farm, directing users to numerous external URLs, one of which is `https://philabc.ru/uplcv?utm_term=gta+5+mobile+android+obb+download`. The embedded JavaScript and the extensive list of external links suggest an intent to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=gta+5+mobile+android+obb+download PDF link annotation
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/mixuvukezuxan.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/94147191887.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/22456568911.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/rifovuxofemavezogaxez.pdfIn PDF document text
    • http://alltechsro.cz/files/69493654059.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/13464618115.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/50844864257.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/meritevafepogofanataba.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/7694476689.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/lofarujizubobabig.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/momidutetosubedapugodomo.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/86539735308.pdfIn PDF document text
    • http://vladekoservis.ru/files/mamiviromenofisamataku.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/34224519371.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/66356279331.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9981161457.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/59805441066.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/tivavula.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/39318668373.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/14132536094.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/durolenikepadulupoxa.pdfIn PDF document text
    • http://shesob.com/file/files/24904145920.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gaxoxupisupovibekag.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 10640 bytes
SHA-256: 00b8c5190d3fccb1a30b5fbd971f2dbe6f16e4c834670a2c0a8e3fc9ff5ec6b9
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 18300 bytes
SHA-256: 5a12d0571eb803c8d6354cb0abe9963a64e1cf432d0f671324565e0703de2043
font_02_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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