Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cbc31eeacdae5f…

MALICIOUS

PDF

92.9 KB Created: 2021-09-20 11:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 060c589bda68d9a51f36f43bbc2f5b4a SHA-1: 939d999c343057fbb80d145e1823f096ac6ad14b SHA-256: 03cbc31eeacdae5fae67325eba98e400f5fa271b588b059977407490b1ab1567
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external websites, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm on disposable hosting, and ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=friv+game+2021 PDF link annotation
    • https://smobiil.eu/userfiles/files/kepemenogibavimosege.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/9726035852.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/76615429836.pdfIn PDF document text
    • https://khanikango.in/file/besedazufikulofetuxu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/koputibipaxo.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/11781192820.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/24938246144.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/21253742485.pdfIn PDF document text
    • http://nfc.soo.jp/file/manunebovovun.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96306283861.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/kakawo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/puwud.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/tenebigalatiwege.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/kifadivo.pdfIn PDF document text
    • http://recviem.ru/img/upload/pagupefifelodobin.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/joxas.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/13659203784.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f7e93ac7918895f086af9e9784218180/35535695648.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pefesopixadapebonumuva.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/71272359739.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/19400708103.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/zorenilozepexonutotovulu.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_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 17984 bytes
SHA-256: e5720fb63deb46cb1915284721840564122a8c51aaa1a537df25e3e2ae6fdd03
font_02_sfnt_off00014f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3D 10252 bytes
SHA-256: 73be52d451064e961c970bca8b6d59ae75c571ddba2edde54971be0f9c8dfaff

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