Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a91185222ec2462…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 18:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d77bada8e5f98ca62d9a23c88f18b2a4 SHA-1: 4f8783c42f0c5d7083d71e78377dc54773d9e200 SHA-256: 8a91185222ec2462752d2c17795deae22ff7dfa8fc2348ba8f61c26d62a43708
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. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using many links on potentially untrusted hosting to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=tiktok+wallpaper+apk PDF link annotation
    • https://braveathlete.net/geektic/files/45263249592.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///rijuf.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/leriwuzafovi.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/81110701024.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/nerovomi.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/8105530605.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/pikotakivezefajin.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/754252413.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/34734334192.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wenafajepixux.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/sisikurizipagifiv.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb6701477---92958868428.pdfIn PDF document text
    • http://thecuriosityshot.com/kubat.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/38805767952.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/9715160335.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/posazizodaxafafur.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/21285168743.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/20703741345.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/vopupadozafuwotizunud.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/vosep.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/15187223038.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/42167473907.pdfIn PDF document text
    • http://belniig.by/public/file/16695749526.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/128df05d0122037d2dca5a3e1e389922/tixome.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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 19960 bytes
SHA-256: f50aa2f5a7fdc39016cb96fd53e5506103030d506a6b4659f55c55c7f041a511
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 10112 bytes
SHA-256: 45379ab52355aab474dacc951ce909809b7bfd483ff05c7621fc0dcb973eed1b
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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