Malicious PDF — malware analysis report

Static analysis result for SHA-256 496f2143052f7a91…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 22:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35ba3992dc0dfa0b8cf1caabdc7ac74d SHA-1: a72a1608899dc97424782055a1f5aaea3f240383 SHA-256: 496f2143052f7a9109a29558488a81d109ce66bfdddcef4440be33246f5a7786
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous embedded URLs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7965

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://krisoc.ru/uplcv?utm_term=isaimini+tamilrockers+master PDF link annotation
    • http://fields-on-earth.com/images/blog/file/kebizalivezibibikixagebu.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/tuxikoritagezosupibu.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/3872788391.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/36437398541.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/fefupewapivakufobaguxo.pdfIn PDF document text
    • https://rinducm1.com/contents/files/68770395078.pdfIn PDF document text
    • https://phuquiland.com/upload/files/55199847480.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/poxitotepinirevaben.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/13748029246.pdfIn PDF document text
    • https://alariel.be/userfiles/file/61776607345.pdfIn PDF document text
    • http://na3.it/misc/file/biburogediwewolexevofi.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/pulazogafo.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/negojivonijugu.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/natokirezadevijojamaf.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/5141888005.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/69373485804.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/13502405357.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a24321c3---sizegopirumuwor.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/46948318618.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/jizakupewizi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091202293714.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2af87969---bikukamuxukigokinuriverob.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/fimuzitofaxeseranetebu.pdfIn 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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10432 bytes
SHA-256: af1db69946630150ba45ac7020a6d8c07e61410dfb05a16060c0adedaad0243a
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 17444 bytes
SHA-256: 37861f0c37be71729dd19ac82d4309600e608f8d2e067acce60e66108e3f8e85

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