Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef56ecc1bad3b1cb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 04:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e187baf24e22ca1a6d654adb444f314b SHA-1: 902532bde52cf93f9f53aa9b97266883a6c073c9 SHA-256: ef56ecc1bad3b1cb877886529d06efe44fa92f9328e3f6437b1bac7a70e4b749
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=batman+arkham+asylum+apk+android PDF link annotation
    • http://venkateshservices.com/uploads/tuxameb.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/nusadabawovunotaxovesi.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907232505.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/fasozaj.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/wutuxa.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdaea06b77---48968346676.pdfIn PDF document text
    • http://myslizdrave.com/soubory/kolimixosavujerefuse.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/zasifezojomazivewugaz.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xokirajifema.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/mexorerimizaneguvamon.pdfIn PDF document text
    • http://ktcz.eu/files/files/62363736826.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631246183.pdfIn PDF document text
    • http://goldia.cz/data/file/26982599409.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/vipefabusosukivatukaji.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/32432825927.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/58138020562.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9e27670998a3a76c8c1c46da865574d9/97025352026.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/71897346525.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/56441083221.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/58326758361.pdfIn PDF document text
    • http://zaiger.ru/img/file/50283993390.pdfIn PDF document text
    • http://kisito.com/userfiles/file/xawumeboxujosabivunuvinel.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/nuwasakepuzesigofewiw.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/kawopotaxufe.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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 17576 bytes
SHA-256: c3c709fb7cac148896028a4bb92d83ff4f4bc25146cf9b388897a71c77c9c314
font_02_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 10884 bytes
SHA-256: 82f1d5a7f6458b4c84ee2adbb0619b769206b6a5983aa1149b4b906d6b309729

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