Malicious PDF — malware analysis report

Static analysis result for SHA-256 5645e064937d2437…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 10:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86f9b25d94c3b021e5afc2d31a30add SHA-1: 8503bbc5546c8d998b144a31942c963b419a0463 SHA-256: 5645e064937d24370225234ef75bb778b7ec738ecf4154dfbd1e728cdd9efb63
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and a callback phishing lure. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or phishing sites. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a likely attempt to host or link to malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://keyflounge.nl/userfiles/file/nuzakagideworudagifizuger.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130048813232---72808482005.pdf
    • http://screen.by/images/file/boruvexiwiwujefidabosi.pdf
    • https://torbay.ru/images/uploads/file/29570064675.pdf
    • http://nj-rshb.com/v15/Upload/file/202192848415942.pdf
    • http://thegioimaychaybo.com/app/webroot/uploads/files/gadojezofaxixexuguvonined.pdf
    • https://classykitchen.pl/web/uploads/files/dajezinexiganebowota.pdf
    • https://eternalbliss.net/file/80391159046.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/vupazijagitizolerarijid.pdf
    • http://abwingsmd.com/uploads/files/torumufexe.pdf
    • https://guruvinodji.com/Userfiles/file/kujegugasemi.pdf
    • https://burstallconrad.com/editor_files/file/wotimurogu.pdf
    • http://www.s-prom.si/fileupload/file/xomaserevanipefazakifepu.pdf
    • https://rhodium.vn/uploads/news_file/vosojuze.pdf
    • http://ncdesign.it/userfiles/files/koluxunavosil.pdf
    • http://humidorio.de/ckfinder/userfiles/files/41817199606.pdf
    • https://zlato-stribro-investice.com/upload/files/merozigasetelasivil.pdf
    • https://dottoridegregorio.it/public/file/widazotolem.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/98363040835.pdf
    • http://saigonford3s.com/uploads/2021-09-07/images/files/16098350412.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/lowapegebupaduzutiladosow.pdf
    • http://greenearthgardens.org/userfiles/nakuzufe.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kekufirufukojowamujotof.pdf
    • https://madeirashopping.com/userfiles/file/70017078406.pdf
    • http://js-space.de/userfiles/file/77688238464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=left+to+survive+apk
    • 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_off0000da16.bin
9dac709925d3c25983a360d13b2a89452bef492af6418439b80bd6e6e22eb644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16420 bytes
font_01_sfnt_off000104b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 16792 bytes
font_02_sfnt_off00011ccf.bin
c38011ed163442ae0d97e1a0f15afbbd1e7d2e82b6b97cf76386478662c0f676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 10416 bytes

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