Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b2cfaa46defcaf…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 00:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23d15a8da386d3b0d59b1bb3b0a62d23 SHA-1: ecccadfa26c75a3d0778ee52743daf579f3d1590 SHA-256: 65b2cfaa46defcafe41c959c8a21497c2607279130a970b1f1bf55c8b942ff64
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2411

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://namlinhchivietnam.net/userfiles/image/file/tonemodidavovubujor.pdf In PDF document text
    • http://partnercable.hu/files/21397165084.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/gokedodetitajubarezi.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/78216411130.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/73650481369.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0910/c68c8169524a74f5b2c1de9fba4c2672.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/46114142683.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/7178064988.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/5518668629.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/85208765343.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/wutogetafowanazafokexu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xaxojop.pdfIn PDF document text
    • http://industrialdevices.in/uploads/padananazovirisojobijunob.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/neragopisixigatopifapid.pdfIn PDF document text
    • http://scsychem.com/upload/files/sovosekefovanebazobalinal.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/jatubuvuxeberolifigilibat.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/25646137.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/xuvufesuzeji.pdfIn PDF document text
    • https://faceless.me/userfiles/files/ninex.pdfIn PDF document text
    • https://computerzone.pk/file/putubudebusawixifinewi.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/1276636820.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/90197561018.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141c44703b2c---74725855718.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/kipabexuwatesajutonuzabun.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/detinufelajuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ninja+rebirth+monster+legend+mod+apkPDF link annotation
    • 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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 18036 bytes
SHA-256: 98d64c519d5499dd55a678cb128a74ce9049261e68de7e6d18f4985c97528c17
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 11180 bytes
SHA-256: c63b363719876852993bbe82c60c3b742264baeb38b8301f73997e196cc0a5ce

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