Malicious PDF — malware analysis report

Static analysis result for SHA-256 f862a90c9ce63170…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 14:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddfc1ba9d3ddccba4fb1a57846874f95 SHA-1: 5d315da1b9f2d700dd0c183f87dc98593e3b068c SHA-256: f862a90c9ce63170aef7fb8590625cfb89e620825fe0dc4ec30e321ba158ac4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF structure and the presence of external URIs indicate an attempt to redirect the user to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=snapchat+verified+symbol+copy+and+paste
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/77710858405.pdf
    • http://naturalmis.com/userfiles/file/63863787622.pdf
    • http://www.anaja-inter.org/public/file/98375009730.pdf
    • http://thebankcardservice.com/uploads/files/bexoxazikaraso.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/32841921027.pdf
    • http://csc-0898.com/userfiles/file/20210919230018_hblb0a.pdf
    • https://wilde-signs.com/media/26092575500.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8219a567---deloraropaxeninijag.pdf
    • http://hotel-ambassador-nice.com/upload/files/weruj.pdf
    • http://graczeonline.pl/userfiles/file/gafijozopototiw.pdf
    • http://elitvorota.ru/f/file/90157993012.pdf
    • http://nwhouse.ru/uploads/file/55849002912.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/4767864881.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16321890207722.pdf
    • https://officialbacknumber.com/editor_up/vuvimiju.pdf
    • https://innotek.vn/uploads/news_file/79875749213.pdf
    • https://bruceautoservice.com/files/file/reletuvedidepebe.pdf
    • http://bilmatbasim.com/userfiles/file/47412464612.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/94066313530.pdf
    • http://regmac.net/userfiles/files/fedajopibobopezozavagel.pdf
    • https://gazeta-msp.pl/user_files/File/newinipekupelulena.pdf
    • http://versobrokers.eu/userfiles/files/59620801280.pdf
    • http://mcenterdk.ru/fck_editor_files/files/61698801542.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dudejagagotixokeg.pdf
    • http://gesundheit-im-blog.de/userfiles/file/gifapukif.pdf
    • http://hidropro.hu/upload/30434041800.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_off0000bb22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 16792 bytes
font_01_sfnt_off0000d334.bin
3ab4815cbe029506443ef18457686cf11009e0680895d2e4595538826efb9e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 18668 bytes
font_02_sfnt_off000102f4.bin
765ccffc805d66dc6903f5041b3521ff654de85e5a2ddaf2fc81cdda7bb67273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 11280 bytes

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