Malicious PDF — malware analysis report

Static analysis result for SHA-256 f924ea60567866fe…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 06:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59a4e08bb9ab7d0f76f3d45cac0714b5 SHA-1: d93d79df84126bc78d6a0b3ecbb993652cf6603d SHA-256: f924ea60567866feb41a23649f65d0ab7217d66e6403eadd71e8e1a6e0329eb5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous distinct URLs suggest the document functions as a link farm, directing users to potentially malicious external sites. No scripts were extracted, but the PDF structure itself is designed to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://planetamama.ru/files/file/58325767001.pdf In PDF document text
    • https://carsen.sk/editor_uploads/system/files/78101263230.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6b7910c2c0d8e392156f2b56da9eec67/wonexilikani.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/50608633713.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/zeduk.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/zafesolewironob.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/38566240507.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/85563331954.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/fabiregepubaseki.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/doxisojon.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/tepumobafajewixev.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/10666023415.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109171955464987.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nigelakirixazamumot.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/wemixotoxeduvire.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1puhvef6hpvomp69j74tktlm3f/44364784846.pdfIn PDF document text
    • http://mousike.it/img_ins/files/pegutapuvajun.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pabagolugukulijefexemuxa.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/47596881112.pdfIn PDF document text
    • https://steammining.com/userfiles/file/49559700199.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xujajaba.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/27263231646.pdfIn PDF document text
    • http://newo.ru/files/files/goforo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+peter+rabbit+movie+freePDF link annotation
    • 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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 10628 bytes
SHA-256: f10ad7a5ff22db697870bc39a80082e093e8d1bbb75328d9bea31df2af7806bc
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 16092 bytes
SHA-256: 127f4ce5003744712dfd93dc69995397853b43c46bb2a97e656d4556bebc7f3d