Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2cabffdc000bc6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 16:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1194d1c24964cb981cb15104dbd88c1e SHA-1: b0690b481d1a968b6dcbcc9dff414211cf4b5759 SHA-256: df2cabffdc000bc6b7e3cb2afa0fc0caddcf49d2988d6bda1de081f6d33f125d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to disposable hosting domains, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests a link farm designed to distribute malicious files. The embedded URLs, particularly those with 'download' in the UTM parameters, further support the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://38e5bbdfe8be.gdziezjesc.info/userfiles/file/bukawomirotopivix.pdf In PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/pofuwotiluwomakalinisuwup.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/89994692358.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/tasedojuvidodikasizoxe.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/49667427167.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/11788284694.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/50264400865.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/251758112943.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cf3eb1b6---11144332406.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161454480d6d1d---kebamosotevajexapokomuwun.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/61301070933.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/67045257726.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/79408334569.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/lukurixajupipegizotidafu.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/77424047712.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/16868674875.pdfIn PDF document text
    • https://advik.net/userfiles/file/bebakigefozudalitesasi.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/7960174401.pdfIn PDF document text
    • http://slovoveri.org/userfiles/83792373988.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_165871CF2D4AEA70.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1764763841613d34e2a8c34.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/2452670304.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/7632455183.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/gidosuwafusezomux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+gps+untuk+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_off0000b203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 14964 bytes
SHA-256: 315d7d82b5b3e84114e03801d21b0ced404c461f5589ecc17be2587f0d912e49
font_01_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 10712 bytes
SHA-256: 289d0e2e36ac5952171b45a12cf2a2f7fc346650c9ab460a31d6d39b5b7eba49
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1