Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df8c76e6e7300f…

MALICIOUS

PDF

88.0 KB Created: 2021-10-07 08:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed476e695d92f4d5d0ff4d6fd048c67f SHA-1: 60c678f35b752037900a139c093a80322f10099f SHA-256: f4df8c76e6e7300fdf4a0d5e3357406293ddd6da6d2547bf3f607cee1ea2c77b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vnationwide.com/userfiles/files/42610723854.pdf In PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/refibuje.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/56ttke796p8v5840ca4rdqu324/bubusor.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/40377952393.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pesezexi.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/41278791076.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/jirul.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/nidejogisozaraxe.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210916_40AFDF9ED72B44BC.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/muzepuwosujumaj.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/51527808314.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17722309000.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/75033162834.pdfIn PDF document text
    • http://dsagco.com/Upload/file/rumawebinopudiwinezimelor.pdfIn PDF document text
    • http://delifarm.com/images/file/4269252446.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/31144414963.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/80885496511.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/fojigibubetanosagul.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/limoxopoku.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/71542688029.pdfIn PDF document text
    • https://bursac.net/userfiles/file/18931808096.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/55567648509.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/26617150577.pdfIn PDF document text
    • https://zzhqhi.com/d/files/71101090443.pdfIn PDF document text
    • http://vitrine-prof.com/files/18314535374.pdfIn PDF document text
    • https://artenika.pl/fck/file/7542655754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=thank+you+for+the+farewell+wishesPDF 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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 19356 bytes
SHA-256: ba2bba7a84297662ac86edf2a35c4fc837dcf63394592121b7eeba247d7da817
font_02_sfnt_off000139ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 10668 bytes
SHA-256: c9d0f2fe0774e15283c1311e288336e12d73ebee55944f57dc11b2264eac2c09

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