Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f37e45609ba7ad…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 08:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8a179b5453d2c95d63506a0d428e6f22 SHA-1: db7786435d351505f65dfc904842228b088f1af3 SHA-256: 73f37e45609ba7ad72ebdce61104a52585b6d4e826e47f7f0527b81be754866f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://queure.ru/uplcv?utm_term=horse+hotel+mod+apk PDF link annotation
    • http://gfk-schwimmbad.de/i/File/818505818.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/lelafi.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/80919595330.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/dizupixomegosulakel.pdfIn PDF document text
    • https://ptogel1.com/contents/files/97626847562.pdfIn PDF document text
    • https://cathita.vn/upload/files/34903629347.pdfIn PDF document text
    • http://vitrine-prof.com/files/66422290183.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zetegebawexajozusafew.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kogibaxevirinufasofisupib.pdfIn PDF document text
    • https://dukupahit.com/contents/files/36855455067.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/25268971793.pdfIn PDF document text
    • https://kawanmto.com/contents/files/lobikat.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42869348011.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/zinusukakawimanobi.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/97458708952.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/figadutikegupa.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/16297172760.pdfIn PDF document text
    • http://lex.tj/img/file/vesenuxumejep.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/6698735935.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/petigedapubupezenogoro.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/zenob.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/37973527820.pdfIn PDF document text
    • 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_off0000bdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD9 16760 bytes
SHA-256: ce0ebda89beb4f75be7efab3e075d80cb2829f03eb29ef58670e73409a81d5c7
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 10544 bytes
SHA-256: ba11cae2f808c9351f99e9dda6e3f27a1020093140e78b74b4f59a5be2c988c6
font_02_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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