Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ace019a75fe4100…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 01:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96c69086a24d26d1aad3baf6025bf116 SHA-1: 0024f5a4f496de0b914f2d6deb1565e3e3e57269 SHA-256: 1ace019a75fe410099a41264972ee9c5f463fea610142da58d0ed4121fcd4c51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=project+xcloud+compatible+phones PDF link annotation
    • https://chachachat.info/js/ckfinder/userfiles/files/savavibup.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/runepubakewuwon.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/71142571951.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/9458885993.pdfIn PDF document text
    • http://orthodoxnews.us/file/20351201800.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210908020236.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/8203602222.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fe0619d7---damakegoxegetawul.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pavetavojugatonu.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631349677.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/wudijiriganodubenoz.pdfIn PDF document text
    • https://synersys.fr/contenu/file/75196472975.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/59224683946.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/77550550536.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/92638651292.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/xadadajuvarifoloradewij.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6923751a53b2be2cdd3824a32a69c47a/83335829602.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/madejoforetujowajipezuna.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/54395927128.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/gexufizidorikogunet.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/56386305878.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/sekofolidat.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_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 17744 bytes
SHA-256: 4f1e7795173e01c750155e8aa9650c5c65f99d3da6698d75bd3bd3b14f33e5ba
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 11252 bytes
SHA-256: 0dc5e4079033a97b715e1b9cb53911ba677783297ff2da4e49eaff37577fbf70

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