Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2986c33a073939f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 02:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf503de960e4fef90458b5ca8133aff3 SHA-1: eeda6af5fe3c5c1426dd1a9e6b13480dc40559f3 SHA-256: e2986c33a073939f51192807b2bfb0d89ab17cf6af0364a9378435c178b714d6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external links suggests the PDF's primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=introducci%C3%B3n+a+la+investigaci%C3%B3n+de+operaciones+pdf PDF link annotation
    • https://kujainspectors.com/candyticket/uploads/page_images/files/najigij.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61426406699.pdfIn PDF document text
    • http://ndt-ultratech.com/files/6183887092.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/79480379426.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/nizumazisulow.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/dalixibuzolepuxutitesome.pdfIn PDF document text
    • http://orderkai.com/uploads/files/88171746710.pdfIn PDF document text
    • https://anup.bo/images/files/2003566771.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/725384022.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/79548298285.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/95070523074.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/46229464408.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/dedereb.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/3314134397.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/newine.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/81026412677.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/57050604909.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/48927883449.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/57026955695.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/fiwopu.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mokajatowikepu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/5103194398.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/15616781126136b88cdec9a.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tusifen.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/57264920566.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/vuvijesadelazofopobogovom.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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 19900 bytes
SHA-256: 1c6316b65b8427a7266f60cc8f54e79ede497dea2d53670193aa3cf245ab500f
font_02_sfnt_off000128aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 11052 bytes
SHA-256: 54ca5636739c5bc07b1ac498d7e113b9d05e2e8a38b1e491da9c33bd97b327a3