Malicious PDF — malware analysis report

Static analysis result for SHA-256 660ea234f45f1f0b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 02:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 235a3dd2fca9c49df99e0e3d602dd875 SHA-1: 68b7c11d3128db4255bcf94997e74a377dd4b994 SHA-256: 660ea234f45f1f0b77b12e1e588aaea0c4b4c80d9642e1c4d8b0018058e64645
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host numerous links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=the+worst+hardest+game PDF link annotation
    • http://www.chp.pl/ckfinder/userfiles/files/zapogixetudite.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nasebozomisaxolisupu.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lidagogupew.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/26508138284.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/pekesifizukewiko.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/gowewativogiserasaxijoziz.pdfIn PDF document text
    • https://cargotavio.ru/files/file/98694707958.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/92256608215.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/71152109666.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xetuziwawa.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/7577979055.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/wolipevabovod.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/rudozopexekinegeridodoxi.pdfIn PDF document text
    • http://firsatpin.com/calisma2/files/uploads/rabatefemufemojidikakuwin.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/50362878009.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gisofuxiwebewulokase.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613761bd37323---67174708321.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/mobawosodesudo.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/xetijukanelu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/puzife.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/61687101921.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/79279289323.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_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 16976 bytes
SHA-256: 340a6ba68705ddadb2ee675524f84fa1394f7347ba51af6cbdd1d81c6926ee52
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 10504 bytes
SHA-256: 3fe6326e207d0515a381aca6f89dd6317f1866624a85a0ad4c121d5a9e4e407b
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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