Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0d23fd3f4ccb70…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 11:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff6db7b3b72309ab215b9b646b8799c6 SHA-1: 6838cf8e9588a8e8f33b44c1322ac668ac747818 SHA-256: fb0d23fd3f4ccb7089c7f134ee23aaf2fecc3a0393c5d2a0898fd64a704d16b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://homeopathyhongkong.cn/files/138199457.pdf In PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/salawog.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suxurobanijifezawan.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/42124100697.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134293d70ddf---zunoja.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/vamusatujuf.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/minetegapeke.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/fujiladuvifoko.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/71066252151.pdfIn PDF document text
    • https://novsport.com/content/File/2156697876.pdfIn PDF document text
    • https://angkalaris.com/contents/files/89485135512.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141742b48329---554964175.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zewulomovukuzu.pdfIn PDF document text
    • http://vlajamo.cz/images/file/5279741866.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/detusasijojojax.pdfIn PDF document text
    • http://klinok-saintp.ru/files/defuzap.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/firomikezijepojirevenipaf.pdfIn PDF document text
    • http://askaudit.ru/price/66395860994.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zixorada.pdfIn PDF document text
    • http://tipiland.net/upload/file/10573730634.pdfIn PDF document text
    • https://what.whatproperty.ng/ckfinder/userfiles/files/litaxuworutaropo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+catmouse+to+firestickPDF 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_off0000abff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFF 10904 bytes
SHA-256: 81a7e8f3484f0a63633b337a681854bb99f020231c2de5f1c7281fa9f38f21ce
font_01_sfnt_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 16384 bytes
SHA-256: dd314ee3a931ddab17bb1eecbcb788258f457570a45f7eceb9f452deb49782f5
font_02_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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