Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a3780ae017e71d…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 11:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa45e6474a4b181fbf5d28c656956c40 SHA-1: 11c01585fe961ccabe7beb0e4619792c30242c8e SHA-256: 37a3780ae017e71da4b40c82849ab21be6c39adc16ca2280d6fa60ae71e37ec1
146 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-heavy nature and a single clickable action, typical of social engineering tactics. It contains numerous embedded URLs pointing to potentially malicious sites, suggesting it's part of a link farm designed to distribute malware or phish credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=russell+gage+fantasy PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/d4e43eng3ojbbuhmjt46ue6qk6/jupuwawofirom.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/gipewijuwaxa.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/raresetuweme.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/981dc972ee4ae4b64f24704c057ee69c/depivegavunones.pdfIn PDF document text
    • https://zagi.hr/files/13266836734.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/lisokokumezamopejawi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/58807045160.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/74424935106.pdfIn PDF document text
    • http://tlznailspa.com/media/files/rusuritazu.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202110010417596698.pdfIn PDF document text
    • https://la-klamm.org/Files/files/lukapulovaziwovexaxatosa.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/timima.pdfIn PDF document text
    • https://bfull.ru/uploads/files/43805187415.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/95694462193.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/ramusaroburidi.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lasonawa.pdfIn PDF document text
    • https://dintek.eu/uploads/file/48179959558.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///konukelagukogeforejonovov.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/87143955879.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/vepebefibetavogopitabuzix.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/27051866018.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/45485080101.pdfIn PDF document text
    • http://chromoink.com/updates/file/89272408153.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/jobeku.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/menemexedexuranel.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_off0000b24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 10336 bytes
SHA-256: 23f2ede388a5bb05b3dc65e63d31b7911d91013b013badda1b0422ec74c93580
font_02_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 14244 bytes
SHA-256: 7bae488deec4ca4b470969a7a5123d3222bc3d3b7675ad8490260bd85ba9c995