Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bcc4eab17d148b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 18:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e14d97f1e44b2ce6d2f5590b6ecddeeb SHA-1: d9db749b9a38de081e052713d803c703c8582178 SHA-256: d2bcc4eab17d148ba70569a0f1fc378c5969bc3d58b1d719b66fe6eeb0473e58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=the+ultimate+guide+to+text+and+phone+game+pdf PDF link annotation
    • http://kccmaul.com/files/files/vovumawanesoju.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/xamafinorujetorupevoxoxuw.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/67947346279.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/gaves.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/73503565938.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/76720923594.pdfIn PDF document text
    • http://paliukenas.lt/i/File/nitumup.pdfIn PDF document text
    • http://zenkatsu.dk/files/jaxusofoladotibodedidu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e678dd001---55153104919.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/jopadunap.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/64665839102.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/pepadafozapitiv.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/kuzenesixow.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/32982070753.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/jojulen.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/wefomadibugagegibijo.pdfIn PDF document text
    • http://sin-hua.org/userfiles/rufesujabawa.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/97603119177.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buwopijowupevozapo.pdfIn PDF document text
    • http://quetthe.com/upload/files/96127379792.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303a1540908---44328207938.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/25627954417.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/nabuvamekelidatelunuvono.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/41548230258.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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 10844 bytes
SHA-256: 2ac2bdff032a87e96e2392a5a04675ec4d560d21fc1bd2cae4bdfa15e75462e1
font_02_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 18660 bytes
SHA-256: cc415c75be6232a742b191d88dbeda7d6088aa42652a1d675ab2c53c0243e12a

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