Malicious PDF — malware analysis report

Static analysis result for SHA-256 17292d19f7141b69…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 22:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35cf63ce1ac358145860d4e2c564294e SHA-1: a0fc315b5be618a766e29f17415710e76ea7d33e SHA-256: 17292d19f7141b695c2c18a22fba3d9648dfe59e6013385e3e636e16fb2cec89
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to other PDF files hosted on various domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://olivermilk.vn/tctt/sites/aaa/file/147351980.pdf In PDF document text
    • https://sysyanginguvenlik.com/uploads/files/jewugevi.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/26685475932.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/78427834285.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kizutubonu.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/77832461799.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/96317677889.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/45651843848.pdfIn PDF document text
    • http://regmac.net/userfiles/files/67913294989.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/86690006194.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7b1d5515---xugutizanugutejididuf.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/89021401326.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/7394362450.pdfIn PDF document text
    • https://oasis-travel.ro/files/13982527758.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/80879463153.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/patijapodulotibeluwed.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/46683147776.pdfIn PDF document text
    • http://medica-brno.com/files/suxofa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a3de572d75b5a807234d8a5d0afda74b/lelolasotinope.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/miwabifelozanabiva.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/59122859470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+headphone+icon+off+androidPDF link annotation
    • 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_off0000b9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C6 10760 bytes
SHA-256: a47c7c34c5289e991407df4ce098b83f9e9e0013dcd64ccbc19fb2b3655f1cc0
font_01_sfnt_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 17572 bytes
SHA-256: ee3e5bcd13fd65aa05815d33005eeb237b30fff7fc6b5fdf7afa07fddc3e1717
font_02_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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