Malicious PDF — malware analysis report

Static analysis result for SHA-256 264eae73faff51eb…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 21:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a1659c3f4f5265880f2513ea37db2bf SHA-1: b23678e2e405266f9d263989779b85a2337bd7c0 SHA-256: 264eae73faff51ebb20b149135d44411481697d65632c2fc2b570f08081d7b16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=sex+age+in+us PDF link annotation
    • http://career-id.org/ckfinder/userfiles/files/nokavevufikajivurenazamot.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/35633287018.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/98809921963.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/pazivegid.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/81608931271.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/30904891712.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/pukezajavisuba.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/zuzaj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161564137c69c1---xofakusominab.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/39104140979.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161405f762388a---80440872662.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/lokiverowuwivuv.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/famixevezobobiru.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xetuziwawa.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/36064440511.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pabawabuf.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/pipagofodoxifapavitef.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/sonedaletiwumupa.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/romitipisemovufamudidumo.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/78569476032.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613defebc84e9---45666019385.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/tasupixubukuguramuxegul.pdfIn PDF document text
    • http://373113.linker.tw/files/63716756885.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/78366273925.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/visemulejozi.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_off0000b53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53F 10196 bytes
SHA-256: 4dac2697c57787f71dd075742cd359c82b4f58a381d8a13f6cb7483d640dfc0e
font_01_sfnt_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 16644 bytes
SHA-256: 73ed1d26dde1b668dfee8d1a09d20a52e12198b175dfbe9e9a67ce2c5fe46b6a
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1