Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c89b1d448f5a4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 11:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb7b1f3a7d64665158cf0f657f99bba SHA-1: cb6c0220556dd0a437d69402d87b0ea4bd9a137d SHA-256: 845c89b1d448f5a4fb593cb8e298eef6158b38aae56c378e3d0b65e58aa24745
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=watch+home+alone+online+free+123movies PDF link annotation
    • http://grgct.com/ckfinder/userfiles/files/71139085638.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/5811288549.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/morexozomosepidaxibolejo.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/43063904032.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/sutisigumutogunorugazodos.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/97359812936.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wivojezisifumo.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/zefonaxudixajebogowir.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/malakafisunugitu.pdfIn PDF document text
    • https://architektor.ru/uploads/file/wugup.pdfIn PDF document text
    • http://xdankfort.com/rhnew/file/99244231452.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/46115612728.pdfIn PDF document text
    • https://euchebnici.com/img/file/xokel.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ba33ea93---disuvidupinuponesozorop.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc03c2f2c---43040355614.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58474307093.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/5459743291.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/21971614720.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/xusewodujizufijikideveno.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/20883010718.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/fukalax.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sidajobutamakawinow.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/21501991897.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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 18432 bytes
SHA-256: 5d63db26d81bce8c27d6f53999df92b73c4959ec971992e810ca1c2c0b313cbc
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 11004 bytes
SHA-256: 8a26bc5703b34bdff51d660c96fd64ba7d5f3cb1f635bffd62ad4ab7529eee35
font_02_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1