Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec0456c4c234d71…

MALICIOUS

PDF

70.3 KB Created: 2021-09-19 14:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a101c33564663ef21d6c91e678adf12 SHA-1: 785d68ce43fd14ce523231142b1775597de0a574 SHA-256: 3ec0456c4c234d71298191a85b33441b99b7ede79d971e34369787fecbbf727f
132 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also hosts a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or conduct phishing attacks. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

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 https://oniceh.ru/uplcv?utm_term=how+to+set+parental+controls+on+onn+tablet PDF link annotation
    • http://panda-es.tokyo/yamituki-n/uploads/files/37734288819.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegudatudefililomudiki.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/43783194799.pdfIn PDF document text
    • http://short-story.ru/upload/file/85763025439.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/xufodi.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/gemamopebuve.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091416161793.pdfIn PDF document text
    • https://majubesar.net/contents/files/12872916680.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/58207862542.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/sesemesomazesafarofexewov.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/goginukefefevumego.pdfIn PDF document text
    • http://www.polni.si/Images/files/fekuxifiwobobizibusum.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109131004169555.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/47325810715.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/xaranonefixinure.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/61071513442.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f851e7ad7---89822368721.pdfIn PDF document text
    • https://cet.sk/res/file/23390627615.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/78200588095.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/lofixebomoribuvonixug.pdfIn PDF document text
    • http://enewind.com/pliki/file/72261503384.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bijes.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/29708395905.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/kalotujedefogerutarifu.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/tutimipopofer.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10492 bytes
SHA-256: fb7a53e29324c9fb55eb50f9aa14f7ebda6216ffce74c7d10a808ba2929ce9e3

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