Malicious PDF — malware analysis report

Static analysis result for SHA-256 7deecc2c8c9c5fd4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 07:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b66cea1b12b99e3ac200d7ef9188594 SHA-1: 5a2b67ade1213cf42f8763a15f8614db2c308d0e SHA-256: 7deecc2c8c9c5fd4bd5d12a65fc2ab41aa602daae8c43a75c8f716f04a060151
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 that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate attempt to create a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=vidmate+hd+download+2017
    • http://sovaimm.it/userfiles/files/pazipowasi.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/55909ed241afbc8b4deaa7320440efae/69923321869.pdf
    • http://amandamaitland.com/images/file/95459247716.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/70055151779.pdf
    • http://sukhonthip.com/file_media/file_image/file/regetaloxugurewujonawura.pdf
    • http://sromedical.com/file_media/file_image/file/63347043828.pdf
    • http://servicedental.it/userfiles/files/wavuwujigiwidovebabi.pdf
    • https://topclassgardening.nl/images/file/49517258967.pdf
    • http://sushiloverca.com/uploads/files/75991063653.pdf
    • http://aybar-gallery.com/userfiles/files/gezuzesafirijeda.pdf
    • http://superfishinglewood.com/uploads/files/loweb.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/vurojanuxabanudev.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/tovirafevexajowanuponeli.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/28337826616.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f14ee0a58---nerepur.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/61518627889.pdf
    • https://mauspro.net/upload/files/selotud.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/59527739850.pdf
    • http://spielundlicht.de/content_provider/documents/files/vukofegitibanu.pdf
    • https://dichvuhappyhouse.com/upload/files/7927983041.pdf
    • https://aep-tc.com/cache/fck_files/file/kujemakigunu.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910101249.pdf
    • http://ilkjv.com/Images/Media/files/77685909681.pdf
    • http://lab4050.com/upload/editor/file/dajinamu.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_off0000c06f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 16792 bytes
font_01_sfnt_off0000d881.bin
e757561b5e718cadef02e17698be8feb8725bd7486443da04529010b82e1c7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 16560 bytes
font_02_sfnt_off0001034b.bin
3f66b7b033169693e03afd759cb08441974ed48f7c420a0d0292115150ac6549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10644 bytes

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