Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca2ceb07120fa88…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 14:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eaebc6c4f23edfd10db2281a6abc3ec SHA-1: 7ddc54c3e0b47104b11658a0eda3f73de85cad71 SHA-256: 3ca2ceb07120fa88507f54f87203ccfe4e1e8c2d12d0430028f9bec438659b5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing operations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this intent.

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://profstil.az/userfiles/file/jigopasojikijuxugus.pdf In PDF document text
    • http://upoart.com/ckfinder/userfiles/files/bojeta.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/95367031592.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/37853185938.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/37473810268.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/xejudar.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/14439882806.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/bepasolevo.pdfIn PDF document text
    • http://receptlap.hu/files/kujekitugibedazudorit.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca88558e6---dapixapurasuzus.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/88688582731.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/lobufotanasudibevemoli.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/puzomama.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/74548866979.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/28001054585.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/15326757695.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/gufitivudawupifo.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/15343514102.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/kurusenuzoj.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf82254ac3---96046498984.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/raxatalupilaluwirenenatu.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/58068120748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=release+of+responsibility+modelPDF 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_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10960 bytes
SHA-256: e31526a94a88bf0c3204a21dd4207f3b41585e94111f7bbb89777bfb19d96ead
font_01_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 18480 bytes
SHA-256: 4a0d2bd44724a1e8daddc79eb8ac2cee6e7307bfb8e7f1b0f49508542ff7746a
font_02_sfnt_off00013837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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