Malicious PDF — malware analysis report

Static analysis result for SHA-256 350e82b4cc3fea92…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 08:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8790f2fb9c31e8291f38168ebfdfada SHA-1: 87293dc21664279832d118ddff00ace8d471e134 SHA-256: 350e82b4cc3fea92fc28be6484c2dd7e7951d66fc234e019d3f1a77a704a5806
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This JavaScript is likely responsible for redirecting the user to external URLs, such as https://crewmak.ru/uplcv?utm_term=gary+vee+crush+it+pdf, which are often used for phishing or distributing further malware. The PDF's structure and numerous external links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=gary+vee+crush+it+pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/govababeketijoretebulalav.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1aa40690a---92322103256.pdf
    • http://hladonural.ru/upload_picture/vufekebapojewarelut.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/568fc72a832d0f0868a0bbabe59e8bed/xojuvi.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/tituniwulix.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/zetufefi.pdf
    • http://topenglish.sk/app/webroot/gallery/files/baxaverenufalojizomuporet.pdf
    • https://dgssu.com/upfolder/e/files/20210924042345.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/72743444410.pdf
    • http://czpohledavky.cz/userfiles/files/pedoxefon.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/81602069267.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909195148.pdf
    • https://siangyun.com/upfiles/editor/files/99244881440.pdf
    • http://potentialdesign.cn/userfiles/file/1632452064.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jaxibuwewegodezewiku.pdf
    • http://optometrystaprzemysl.pl/userfiles/file/gewedupi.pdf
    • http://saigonradio.com/userfiles/file/41572213386.pdf
    • https://binarbaid.com/public_html/userfiles/file/kewedibun.pdf
    • http://duocthientam.com/uploads/ckfinder/files/40468606889.pdf
    • http://xn--elementy-zczne-kwb98g.pl/media/file/lajodokit.pdf
    • http://hftyby.com/upload_fck/file/2021-9-17/20210917041642944086.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/joruwuvuniwup.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_off0000dafe.bin
8e625195b35305777be8c6e0e5e4fa45f73f1a728bc1896c44b50e50d69a8798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 19800 bytes
font_01_sfnt_off00010f2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
font_02_sfnt_off00012742.bin
789a6018fee2462b4e9758afa14aeaa9a472a28b84105635dc9a25c7cfd387ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10764 bytes

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