Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3714d8f28141364…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 08:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d91d862bf9166279a9fd3c4d01c36f9a SHA-1: d434ce9da48f917679465b335c6de0d39f0d3115 SHA-256: d3714d8f28141364d95bbadc1ec00c885aee9081de43b69251669284a023abb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references numerous external URLs, suggesting it is part of a phishing campaign or a downloader for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=android+camera+permission+manifest PDF link annotation
    • https://ddnepal.com/assets/userfiles/files/larawitikelokoxi.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109051146307354.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/vimoxekiwarubitupage.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/42249542339.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/5594016206.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/larezigesatigamowi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26263df2---86810634782.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/42105926955.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/38259085675.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/pulorevijesasalewodokasa.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/73817009553.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/3305521241.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1hfr6rhbb2ve3han7qngfa1n5/retemo.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/6742677744.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/64019327670.pdfIn PDF document text
    • http://chinazzjx.com/d/files/niwekojujomufuvurinu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/48662914257.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/wetusufosuge.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/norap.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/laxizudakatowi.pdfIn PDF document text
    • https://artenika.pl/fck/file/54808824044.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/runadasaxi.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xeguni.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/32464866038.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/21569229996.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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 10716 bytes
SHA-256: 611e3d35bd940c7f51f61ffaa8e332367e781a8e484594ad33a68bbb0b4e6c1a
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 18544 bytes
SHA-256: 1c9cee00643cd59a852176db7d10b3c631104b1ae19719a3b98fbd2e5ece10e4
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1