Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8a84e74c88af7f…

MALICIOUS

PDF

63.1 KB Created: 2021-09-23 12:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 30d50585ab717fda2b2c1b608c015ea9 SHA-1: 2c9272a5f36e5f0cd308fb0e4871984edf0f6122 SHA-256: 5a8a84e74c88af7fa1eecea447c7fe45e1247b14e54d01e6de65a18e8bea7b87
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9495

Heuristics 4

  • 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
  • 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=pes+21+obb PDF link annotation
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/92759690865.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/54987011493.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b48f3fc2138cb294bc94259e53ff7e56/97765424654.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/32709513134.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/wadujobitaxabesubip.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109210654008126.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/80164676233.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/wodajukurupitisozubix.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/165211986.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wosomukal.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/zijoxikagiretug.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nukomunitone.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68243460146.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/88663057895.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/35635637218.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/74937362662.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210916152834_8k5jhz.pdfIn PDF document text
    • https://hse.tw/upload/file/jazuxemunale.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/95460963609.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/37359851670.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/35629201845.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/bowoxazefiwegutun.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 17808 bytes
SHA-256: edc5e73ff8fad0fc2faa6378f508a0120868715c9d32246f8b59d27f1298ddfa

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