Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0803461442ba49…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 03:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b964e62f24cbd0d26c9cd5399ac91e2 SHA-1: 203f68965fc18878556217e1ed8ff3a45094ef08 SHA-256: 2a0803461442ba4992abc0b42c585cbbb583353e9f9fb2d16dae5daa08ad6f14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or scam campaign. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites.

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://philabc.ru/uplcv?utm_term=how+to+find+a+deleted+contact+on+android
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384911d40c5---lazonudegi.pdf
    • https://usgcambodia.com/userfiles/file/28169005373.pdf
    • https://stoneappeal.in/FCKeditor/file/xalizus.pdf
    • http://oecschool.com/userfiles/file/munifasezulizozimilok.pdf
    • http://immobiliareborghi.com/userfiles/files/filidifaxufenovitepike.pdf
    • http://1day2night.com/UserFiles/file/2192551253.pdf
    • http://forepic.com/_UploadFile/Images/file/10144400039.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/57870022750.pdf
    • http://worldnaturalfood.com/image/upload/File/zimokuralelivotel.pdf
    • http://tuzvedo.hu/elemek/file/pomujesagemagedoralidivuv.pdf
    • http://cpviettin.com/upload/files/17390428797.pdf
    • https://anhhuynoithat.com/asset/files/muvubuxopito.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/jinisedipepu.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/14rb7j8ecalbnqbm8fagub78e5/bodaranitojilozepev.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/27085466207.pdf
    • http://swaptoys.org/ckeditor/uploads/files/97055262679.pdf
    • http://abwbaltimore.com/uploads/files/49450799746.pdf
    • https://icoachyou.biz/images/ckeditor/files/migejomaveg.pdf
    • https://tonere.shop/app/webroot/files/userfiles/files/68513126210.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/63841858227.pdf
    • http://dga.gr/ILC/img/file/20918312161.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ad.bin
b75d7a5cb533b2200c5be31776a6df915e6afc1630c8ad270e422a8f44ea845a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 17956 bytes
font_01_sfnt_off0000fe9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 16792 bytes
font_02_sfnt_off000116b4.bin
f18a80267f3ab1c56db84258a4c5f1bf7726662152a7dfa9cf091ae7788ed013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 10376 bytes

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