Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb47622128eb12b3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 15:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7eb7df47dce4c6968c71b6063984df6f SHA-1: a13259368526b3da8c4e331c0ace710d9056ca60 SHA-256: eb47622128eb12b34caf39f9184c84f6ae485026e400a75b71366cd7ed7a3928
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious destination through numerous redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=hum+tum+putlocker PDF link annotation
    • http://tuzy.pl/Upload/file/fopalebabozejokuvira.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/14966012765.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/66804217518.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/luwixepavadepiwivejamuto.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/jewut.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/84579368971.pdfIn PDF document text
    • https://educhina.mn/editor/files/guxez.pdfIn PDF document text
    • http://lobi.md/userfiles/file/jekiwi.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/vikulukevi.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/vuwafifajuduberi.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/rerar.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/94487685826.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/56823088856.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/43506568769.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/11824553962.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061906482476.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/kenapilakedi.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/6478366545.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/56757722827.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/balibuzimolozez.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fbl836rgg36bk52bgv3ke1n32a/zikigumon.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31cc79013---83276024166.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jawani.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/zujumetag.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_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 10192 bytes
SHA-256: d8c58522e1059923d399770da676c9404338628a522b2bf7f19126e7159295db
font_01_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 18788 bytes
SHA-256: b69b80f023fc68fa301d3af8c33096e088c8f07c4fdfbc2e6ea1845d221b62f4
font_02_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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