Malicious PDF — malware analysis report

Static analysis result for SHA-256 283fd214922825c1…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 08:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a1bdc9a8ae68511163b8a983e901258 SHA-1: 5eca8cb3b82fce85ef45bf96578fb2902c69a3d4 SHA-256: 283fd214922825c17a077edd771e7857a6e6fa79f147eeb70d1e485565f7477b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are suspicious. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://podhoru.cz/userfiles/file/3698966943.pdf
    • http://milwaukee.center/userfiles/file/91152063370.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/48b3e4dd40086de4caf04d3e486faf8a/42534508067.pdf
    • http://apart1day.ru/file/74613194795.pdf
    • https://zabulgaria.org/userfiles/file/tajuwebudofamudifufi.pdf
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/32874578272.pdf
    • http://yuanhebiotech.com/upload/files/11900220859.pdf
    • http://romengo.com/ckfinder/userfiles/files/45244572454.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/winigologasatirepexoli.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-20/20210920232620698253.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/30952345547.pdf
    • http://ritadas.in/userfiles/file/tomaxipidikabazesa.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lomufu.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/51479528836.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/41228864777.pdf
    • https://dalilak1.com/userfiles/file/jupomif.pdf
    • https://embassyinvietnam.com/webroot/img/files/45143713892.pdf
    • http://restravel.ru/ckfinder/userfiles/files/wibuxisisejikaziji.pdf
    • http://koddous.com/userfiles/file/vidakalime.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tom+mitchell+machine+learning+book+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_off0000bf3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 16792 bytes
font_01_sfnt_off0000d74d.bin
66f21779d509a43d3bf1e8706c22f90413ace85faeeafc4ef58bbb3d09340695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 17284 bytes
font_02_sfnt_off0001049c.bin
2f5fc755108f960a1decdad748968087acd132f9aa17f134fad022d14106de95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 11096 bytes

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