Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ac47334d49413f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 16:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16c89c6b1031ecc64303818a80db048a SHA-1: 3ea4f3b82b19df0c851bd3f18a7b8ceda261e71b SHA-256: 75ac47334d49413ffaffd27f8b863614ed3d5f831d21e005e81e79d32aa20676
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=how+to+hack+instagram+free PDF link annotation
    • http://weldingplaza.com/files/file/7574008522.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/26307699639.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909195727632852.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/92655452.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/12338089314.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vapotolujorafi.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/4643360790.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/11065461101.pdfIn PDF document text
    • http://355353.ru/userfiles/file/24927757929.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/22161302088.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/42642462560.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8eh30djn898ltlu9rauj0sssao/boforozojivodetedatarakez.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/lusekeduxunotezum.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/94181773833.pdfIn PDF document text
    • https://renewone.de/files/fasedugonubipaxewami.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/topuferumasam.pdfIn PDF document text
    • https://service-panev.com/userfiles/40854457869.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16308799471717485090.pdfIn PDF document text
    • http://lg-palette.com/upload/files/61773266545.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/85345080773.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/44898017101.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68554999289.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/05/xokefalum.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10908 bytes
SHA-256: 11c1ba6b9d7107e9c94911b8639e51208fc6659688b728e2868f3d100074fec8
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 18912 bytes
SHA-256: 3fe9ec60fce883466220038b5572cc9f937f2c04cfc3157dcab4f020e4caeaf8

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