Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6faa2e37f433349…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 09:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc167d2072a0dba928d2138c8ae1db7a SHA-1: ecbb275257a965efbac867c125e99599b4e674d5 SHA-256: f6faa2e37f433349d8bb291180e98fdb29f1a2fb283f217846f0dabbf86585ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to link farms, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host multiple malicious links. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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 http://avandcie-automation.fr/ckfinder/userfiles/files/70639117482.pdf In PDF document text
    • http://b40555.handyfriendship.com/upload/files/fegijozupafotifuj.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/96748849064.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xometexurewubigapigoteso.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/puvoximorivi.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/39835324811.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/watunusogenori.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/71544911427.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/tevusesiwavoluligupol.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/bugozafamokogufe.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32816695576.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fuwanojoziwavofeda.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906075131.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/72685559236.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/fovofejogixudarixuduba.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/68861983192.pdfIn PDF document text
    • https://songhongresort.com/img/files/20130147304.pdfIn PDF document text
    • http://usmleworkout.com/files/file/fapomatiwuzugemaru.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/goxidusakutajim.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/dixuluj.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/volemirakujopide.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df4aa7d0e0---jeziwujulikira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+apps+like+picsartPDF 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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 17352 bytes
SHA-256: c8543dd2c6e871a4a38547f74ad7218f181c2488131fae788736e9f500749b1f
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10212 bytes
SHA-256: a238e58637d6dd276db28a9ec106005807971d86c032440d369aaa02a946f1da
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1