Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cf18a3cdaae352…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 12:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49b15fee1d01776e444804f306130ad7 SHA-1: e8ad63a9d480ce9253a126e2fc838b1593475b88 SHA-256: 80cf18a3cdaae352b21e6b2635f9ce6583bd47aed6efcb67108153bcc46b8c39
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The 'Password-protected archive handoff' heuristic indicates the document is designed to trick the user into decrypting a payload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=telecharger+gta+v+sur+android PDF link annotation
    • http://youzedu.com/ckimages/files/20210901155516344802.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/jedijevokefape.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/rilijaduk.pdfIn PDF document text
    • https://unitjaya.com/contents/files/45815597538.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/gogowezusepimigu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6500e035---rifetodiwasubetoposin.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/farapufukumaduvomajevitij.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/numigufumugilotefepi.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxowifelimuwozoniwu.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/6597365845.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/wevadarafutesoda.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/pawapukiwiz.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/tozuxogirezojanam.pdfIn PDF document text
    • http://enewind.com/pliki/file/13388993191.pdfIn PDF document text
    • http://roocenter.ru/upload/file/21020734048.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202198222755576.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/wefibuzerazuxufepikidonu.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/satubozajagipuxajajoduv.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/bitesugiti.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/tukukikatirebokesipota.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/84364885977.pdfIn PDF document text
    • https://mikludava.lt/images/files/40909217236.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zimulujitojoku.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210917_CA74034BFCD9A140.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/kutowew.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/vunagazixoxu.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/19586407790.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10780 bytes
SHA-256: cdfedf7cf7575c9f1b19e7e92295b08254de60289e19146eba135f49f7bb0837
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 19840 bytes
SHA-256: 7042b34c55711cb28cec760266cd290086416ad92293fab1357bf7469ad403d8
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1