Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e8900204d92291…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 14:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 416a2527a7adfcf7f9e683d71cb40e9a SHA-1: 846471e818ea67c097933485f5b5ad404db2976f SHA-256: d9e8900204d92291119313460ae1c45d05a8ecb338f3438c69625c04cf575879
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially malicious or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=d+day+hack+game+download PDF link annotation
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/wotobagonukenadapusozuzej.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/9332526000.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nepex.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/11138565194.pdfIn PDF document text
    • http://sgpeo.pl/users/file/35522653259.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/43793911936.pdfIn PDF document text
    • http://foxadv.net/file/satibinuxoran.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/larudinaran.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d667b54e---54686852192.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/50783360931.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/zatedira.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tivibodekejarigaparu.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/26014464860.pdfIn PDF document text
    • http://abpaluso.com/upload/file/82009529439.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/48184230137.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/razizugesa.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/55900525392.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/rifenexefidosawipiti.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210922_194A1F9AFD42FEC9.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109150728452230.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/durolukumaziputowokufuja.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/mesup.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/81768030637.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_off0000c2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 17612 bytes
SHA-256: 6e5d90070210025d5c29118f9ec078773b3f34d1c768846808b3c08b1040cff9
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10652 bytes
SHA-256: 5e22bfae12dc8c6e48f57b3f17538bb5f5a7c11adc5046e4355f7e7646d80904
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1