Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff26a8df8f2a7294…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 12:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f210ce26371e401dc89b9cb45e5fa75 SHA-1: 6494692bd096e64b493fa93266090aa1b917f1c2 SHA-256: ff26a8df8f2a72943b72ed06aa7e2d130c7d1d61ae9eebc5658a2edfcd84187b
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating an attempt to redirect users to potentially harmful content. The PDF's structure and the presence of many links suggest a phishing or malware distribution scheme.

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://masukpt2.com/contents/files/wopaguragi.pdf In PDF document text
    • http://cn-polylysine.com/d/files/72512040948.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/24969919540.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/52362699262.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kuvokarixelivirejutafa.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904133614646153.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fozunuwuke.pdfIn PDF document text
    • http://tercovci.cz/files/file/48466656830.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/gowujugabudojaterijetub.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/vutitufesuwujemizimupov.pdfIn PDF document text
    • https://tcremich.lu/files/files/sujuworezakow.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/77156238950.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/82184015692.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/18495989166.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/78396710543.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/72067134624.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109112027314518.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/32966867620.pdfIn PDF document text
    • https://5uempat.com/contents/files/tozav.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d216294---47265108250.pdfIn PDF document text
    • https://slide-bearing.com/d/files/19807028576.pdfIn PDF document text
    • https://sergiomauri.com/images/file/binutolomedizuxus.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a4esc5coqabq6tunf30g1mq9fn960ue1/2775767843.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/jivelapif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=davidson+textbook+of+medicine+pdfPDF 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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 11036 bytes
SHA-256: e3d0e79f695066e1a077fdb155e63ce3840b8217a00703caefce630d1256acdb
font_02_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 17244 bytes
SHA-256: d04b7162e40c6371a5b512fdfa9b17c006022d45f05e67bfdf500523194c0728

Open this report in the interactive analyzer, or submit your own file for analysis.