Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf666a166c936f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 05:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11fc3c38cf0e5c306c13dbc61a5add38 SHA-1: a9556b39b123fa645485005d86b8a2928ae5de6b SHA-256: 8bdf666a166c936fdb0d8ba111edea617d8d741e8607dec66bab7f9cc92938e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to a URL that appears to be a redirector for search terms. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=super+mario+bros+for+nes+emulator PDF link annotation
    • https://artedeeducar.com.br/ckfinder/userfiles/files/32729859927.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091702485675.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f244b2cdf6---wivivonumasidisuviz.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/relimupufatazuvasenese.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/13030731325.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16305844621970637385.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/losekiwositapun.pdfIn PDF document text
    • http://fruitsad.pl/images/file/2726017820.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/89910201071.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/doninudaxevoz.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/20661091791.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/mudabigikoto.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/povutizesivuzemopi.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/84579287644.pdfIn PDF document text
    • https://grnca.org/img/files/files/kiwiliburazenoxikokuno.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/kinusat.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/xuponasegolobabopupo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/54499548854.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210913_093039.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/83183803534.pdfIn PDF document text
    • https://betsin.org/userfiles/files/xewewapefeviko.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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 10832 bytes
SHA-256: 055883168337f60d976ac94531478d1c927e10115c6e2c5ab88eb86a8754da53
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 21280 bytes
SHA-256: c4c08679f0ffa6a39374e8dbdbdae19b877f5ad0389c7e807d53b31b79df3a6e
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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