Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7649db60fe16e6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 05:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd6daa196533b8ae4d5d23690b4f48b1 SHA-1: 8fe4dbe6a5203aef5670d231706ae7e10de5df94 SHA-256: 5f7649db60fe16e6d975f5b9aafb63df8445e08d19a594d4ea132a6b3f949814
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to external content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://schodylux.pl/userfiles/file/dezak.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/93337754817.pdf
    • http://georgekoldun.com/var/upload/file/mamifalobevulomexiwakot.pdf
    • https://85097781.com/upload/files/rojuletuzaxetosafoz.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131b76f69ae2---xobatubivumugerovumot.pdf
    • http://indago-rovigo.it/userfiles/files/92498499859.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb7865413---xokewujopulo.pdf
    • http://borik.customreal.sk/data/files/tunupitasevujekesasoti.pdf
    • https://www.medicalbi.com/ckfinder/userfiles/files/73323092532.pdf
    • https://sanagustin.cl/files/jetajulozupevajodoxifuru.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329ddea5faf---5545605730.pdf
    • http://mid-europe-ex.com/images/blog/file/lokobebuse.pdf
    • http://interno-kazan.ru/upload/files/siwerela.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/piruzofaluvin.pdf
    • https://lesrimaudieres.com/images/uploads/file/26320490286.pdf
    • http://bagodilovaspark.hu/userfiles/file/fovozuzufewa.pdf
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/45849349255.pdf
    • http://xedaphcm.com/luutru/files/polobuvigidedokumot.pdf
    • https://bizimpin.com/calisma2/files/uploads/tujivumejopejovam.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/wesujejuketuwezifekiz.pdf
    • http://growlink.biz/userfiles/file/liwomomogifido.pdf
    • http://ranfeng.com/userfiles/file/2021-9///202191181735343.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/sofuzilokuguxozudim.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/29284713224.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=symptoms+of+needing+tonsils+and+adenoids+removed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c276.bin
de334f74ee09c5911cee81dd21d8efeb915863defdbed34fecdb8574c99226e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 16568 bytes
font_01_sfnt_off0000ec50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16792 bytes
font_02_sfnt_off00010467.bin
0db7992b22cdd7e56572c393976b7d0d8ca620a0559c75343c000809f5043634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 11096 bytes

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