Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3890e64974fdd8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 00:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5385c0821cb0a7dc31c26e7d5c43314e SHA-1: 0a75bf17a9c142c553bbec63e26a237cf631d037 SHA-256: 1c3890e64974fdd8066c08dfc04ed63577fc300e545a5742eef4434c6735d56a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=beyblade+v+force+download+apk PDF link annotation
    • http://wonderpanel.com/app/webroot/img/file/xejajaxadifuxoxolajegeviz.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/59860030936.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cad889160---vizaranif.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/64146598536.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/78818122953.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/76338520780.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210902031658.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/89546777818.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/83704939702.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/tosarijodesavigudolumi.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_2D3896F37D46F095.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bonudepuditimapuli.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ecfc164c47959d9a518c23a0557a1ecc/dofubodixefodifagumigigi.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/zebiwunamotusaruziguseku.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/29264292848.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/47949348450.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/95894377411.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/67561832956.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/85091301371.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/17536345134.pdfIn PDF document text
    • http://baoveantam.info/upload/files/84852994472.pdfIn PDF document text
    • http://askort.pl/Upload/file/18909323098.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/75465768631.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/43659094999.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/85277432908.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/tikowivivokutuf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1
font_01_sfnt_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 10808 bytes
SHA-256: 474bb3a84e9c119558551dd7c0218e4a9a5cd09ea7481182747ac6d2d31502f0
font_02_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 18908 bytes
SHA-256: a0c5b15567a3fefe5b2bdc7dfc493f79698185f0df10c3dabe502bf33482c5ad