Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc9ab6eeeefa650…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 03:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 917d0f077c69ecbb3d99832383b718c8 SHA-1: 4c32c49357f945af89ee1f16a68f6840698dd312 SHA-256: bbc9ab6eeeefa6501e35eb95efbbc5850a225655f4392452fbd0d1d8e7697b09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=you+torrent+apk PDF link annotation
    • https://namphuctourist.com/userfiles/file/33268595469.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f2f8110766dba0a024c0c9e169bc9222/86620203601.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/tajerutijapofa.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/81553631251.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/32638278774.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/zezujepuwato.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/52019877046.pdfIn PDF document text
    • http://119pump.net/d/files/taxip.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/46246994218.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/motemopatukuwuf.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/86167857969.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/wileriwagikipikam.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/sazosunukevifun.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/modewizapetukirarokokuzab.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/95370326099.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vbif984fsqjcrssjva85tarno0/sesafubusil.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nofegerikojurovajuw.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/dokumenoforezisuj.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/renoke.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/90991253881.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210916055604.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/goberiwu.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/senumopud.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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 10116 bytes
SHA-256: 1125e3cc8cb5d6e46e5a33e1c70d61efb63da10a58a29823283699f2fbe72cd0
font_02_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 17760 bytes
SHA-256: f446ee3d3c6d58ba8956f4e7e69e7a22e591cbcc6a119c1029eddac818cf4725