Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4213a410efc8c6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 07:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37439d89790530017a6931e4e969202e SHA-1: 5f8e9ca905116a3a68b3743d19de83b93ce2baa9 SHA-256: 7b4213a410efc8c63bc9bd26e2c78ac844fc4cd9a8572d1e380d396e0987912c
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 phishing or trojan threat. The PDF contains numerous links to external domains, many of which are hosted on suspicious or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/89eb80ca03f9d3b09fbef5787b78e673/difiriwetopowezi.pdf
    • http://music-saikung.com/ckfinder/userfiles/files/53879736429.pdf
    • https://contemporaryteas.in/admin/uploads/file/46509503445.pdf
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/muliwetifefubu.pdf
    • http://alwaysshine.com/fileimage/file/2824970715.pdf
    • http://crosswaysrecruitment.com/userfiles/file/kenudoturopekukipi.pdf
    • http://budaors.varosom.hu/userfiles/files/60895325471.pdf
    • https://fokusmedia.com/images/uploads/9594280988.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/defefuloj.pdf
    • https://officialbacknumber.org/editor_up/11329139124.pdf
    • http://www.jindatunnel.com/up_files/file/56383239682.pdf
    • http://greece-ex.com/images/blog/file/52983934691.pdf
    • http://gamecoast.by/uploads/files/97808851511.pdf
    • https://mimpiindahsatu.com/contents/files/bikixojivevubokenagabetap.pdf
    • https://rimsball.com/ckfinder/userfiles/files/dojexirovov.pdf
    • https://bloomlight.pl/_bloom/file/vafakutag.pdf
    • https://parklanehotel.asia/userfiles/file/13769308737.pdf
    • https://radio-clipa.ro/userfiles/file/94061320331.pdf
    • http://df-2.de/images/daten/file/woxivibelu.pdf
    • http://esrafisek.com/images_upload/files/rigilarinurafufozaveduf.pdf
    • http://plaschke-partner.com/uploaded/file/94388945396.pdf
    • http://c-six.it/userfiles/files/8835176889.pdf
    • http://taiwan-casters.com/userfiles/file/47142713677.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/vonabepapuzevepozaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+game+naruto+android
    • 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_off0000b2c5.bin
2be476520f3929205afb116c4aed9d22e4af133274e8d199eabc36b2b53130b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 10612 bytes
font_01_sfnt_off0000cad0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 16792 bytes
font_02_sfnt_off0000e2e2.bin
fc362b6dce5d110e4ce7e5d0ebe3f8405ac53ea9d90fe963e193a2dd256ce10b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 15080 bytes

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