Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb8c8a844e6bf8a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 23:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45b98faaf443fd06413869c40791166b SHA-1: ab2b5da8ad608e9e29edd45485c2ce73bc8304b1 SHA-256: bbb8c8a844e6bf8a43587f8e14fc7947456ad7534b32fa9faee70c9bdca5869c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are on disposable or link-farm-like domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=best+graphics+mod+for+gta+sa+android PDF link annotation
    • https://pierrelemagicien.com/userfiles/file/wisawipoxoxi.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/67583864662.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/65682055975.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/ganaxazevamogifo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/g950rq7e0etb6ua4e6hh7t3qf8/43986967522.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/45826763978.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/livijizelobunusujubow.pdfIn PDF document text
    • http://tulga.ru/editor/files/tuwaponixosewokaz.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/gosaxadevaxarowajojoku.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vufotakisonuzidera.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/7857390559.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c98351d9c850bdd8886c62009531d507/35409268671.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210919041623.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/podev.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/60418670301.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/81708621982.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/merasilezotinaxuwinokovaf.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/11434561410.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/80522573962.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xeled.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67168962400.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/gelutusupabufo.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/jexulojebutiwekinajipole.pdfIn PDF document text
    • https://ptogel2.com/contents/files/82573172401.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 17364 bytes
SHA-256: 7e32c66ca7fa49d7bc59b582dca1d2329c5f1adb96d3551b79c367719afe1f56
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 11076 bytes
SHA-256: e5280b0a9277d945bc5543cee2fedd7239910a0b46d0cbcd5a1d6f798f377ea6

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