Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e85b245d50a2c0…

MALICIOUS

PDF

79.1 KB Created: 2021-10-08 17:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a91fbd77a00fd3f8e6d10c4189e4db12 SHA-1: 21238f7f0518c844c4c402c94ba90a7444afd0cb SHA-256: 37e85b245d50a2c0440666a738eb54fe08eafc1f9eb500c7a109e114cd2f44b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to lure users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=choosing+our+universe+question+answer PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/13141896821.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/6474422250.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/sefegete.pdfIn PDF document text
    • https://gilbertems.com/videos/file/87414810646.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/famuzupemaduzugiregipezu.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/finusowiserotuxugulatibi.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/82976800516.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34230112291.pdfIn PDF document text
    • http://dsraxys.com/uploads/99578315666.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/85133404026.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/vobage.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/noroje.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/dekasixikejegejuvoxu.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021930210112853.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/2622309672.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sisewufakokirir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9bbc9fcf---76669157215.pdfIn PDF document text
    • http://standardamulet.com/files/files/625592569.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lasisijivifutilaba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77513539334.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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 17296 bytes
SHA-256: 5a43664347da5f13cf58e072068d08c8a0ffcfafba45f0000b60011a22dce565
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 10768 bytes
SHA-256: f71aa01ef5bd5383e330aa981f2574c44e6c3433dfef5abf6fd5aa9f4e7dfc70

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