Malicious PDF — malware analysis report

Static analysis result for SHA-256 537183151d268f7a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 04:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44b4fcc9e534c3cfe6fa24bff257a5a8 SHA-1: ff5434adcf366ed66a83bed5df5cdf0cedbf9374 SHA-256: 537183151d268f7aca24173e6a6d1326d602807ff2dd716e9502eb1ccdae7cba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The presence of multiple unknown URLs suggests a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bagliodeimille.it/userfiles/files/53161116937.pdf
    • https://marblo.marblobaths.ph/app/webroot/img/files/degorovo.pdf
    • https://aletihad-group.com/userfiles/files/gumija.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/16873427448.pdf
    • http://www.valaisconsulting.ch/file/45340049808.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/51035589063.pdf
    • http://shmgec.com/Uploadfiles/files/bodovemobe.pdf
    • https://foodexgida.com/uploads/files/rosazuzofu.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/torosexevil.pdf
    • https://huanghecables.com/d/files/wagazavozugovutowiboze.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/wojuzenafonadipel.pdf
    • http://furniture83.com/upload/files/waxedoxejixexenisop.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/diwasapakexepezixevumikim.pdf
    • https://tutorbolivia.com/userfiles/file/pawekenijub.pdf
    • https://basisangka.com/contents/files/xuvujimi.pdf
    • https://forumsevens.com/images/file/36831049254.pdf
    • https://qkon.ca/images/file/zarus.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/vipigiwadi.pdf
    • https://bbox.ru/images/shared/file/loregonirimap.pdf
    • http://www.urbanwaterways.info/files/81773682889.pdf
    • https://ciar.vn/uploads/image/files/42365860309.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144210289db9---xojito.pdf
    • https://onthespothousing.com/userfiles/file/89676882032.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mecanica+estadistica+pdf
    • 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_off0000cbed.bin
827aa79d09a440cf9863bccd7599e16142385209de8d0b9cc0b53bc03db6d692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 17748 bytes
font_01_sfnt_off0000f9d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 16792 bytes
font_02_sfnt_off000111e8.bin
560ef05d0f8bc09e359d08f8888fe8746437cd3d7cb9dbeddb83b13bec8373b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 10340 bytes

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