Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0912899ac0c051e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 20:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06b50f99c70b17434e1d1675937f1d38 SHA-1: 51310f690f3a8aad8e9c3c8b48bad2fb0a1fbc48 SHA-256: c0912899ac0c051e328d80fa27fc29b7b467ecf725596f13af79555e3899df5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda31beac8---14324263193.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/43722227763.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/62713441827.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/33834827970.pdfIn PDF document text
    • http://moristas.com/userfiles/files/58458344308.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/biwamifufivugefuni.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/ruzisag.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/bemevil.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/32458387789.pdfIn PDF document text
    • https://red-adlay.com/upload/files/98235533790.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/42149614366.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/78162105457.pdfIn PDF document text
    • http://usagimatur.com/files/others/50784403477.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/12098181300.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/13824117541.pdfIn PDF document text
    • https://maria-galland.ru/files/file/28369911862.pdfIn PDF document text
    • https://triosms.com/userfiles/file/75247127763.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/naxurukoba.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/lufezerewezitifopesileki.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/zanetanapuliwaworejif.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nujutipuwexep.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/16543430206.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109190823429443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=all+apps+not+opening+androidPDF link annotation
    • 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 19112 bytes
SHA-256: 5ee1b476b3f53ac2581e3c88da43358ad8c359cad0a28dff77ac06f4498256f9
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 10548 bytes
SHA-256: d9dc495d266b60eb6c380d11e078716a982ad9d729ffefe0611cd2b230b2100c

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