Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc97164b6542e56f…

MALICIOUS

PDF

125.4 KB Created: 2021-09-19 21:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d08bf81125f28083f36b333f5fb0298f SHA-1: b97cfdf9aa5d3c615f09e99cf02074fa010c53ec SHA-256: bc97164b6542e56ff98f37bf13f3c2aca7edb9c5882c42d9c698e229efd1fdec
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF structure and the presence of external URIs strongly suggest it is used as a lure to redirect users to potentially malicious websites, aligning with phishing and credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ketchas.ru/uplcv?utm_term=xperia+play+ppsspp PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ec98b25---64931661073.pdfIn PDF document text
    • http://liluby.com/upload/file/gapekiles.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/nevisujibom.pdfIn PDF document text
    • http://fitviewer.com/files/file/78371376970.pdfIn PDF document text
    • http://eternoohydro.com/d/files/sariwepigiw.pdfIn PDF document text
    • http://apicn.net/upload/files/mavudexuluguxebeparoget.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/velibowutizivimirad.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wixoxuzufowabulej.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/subizolajisikixidakugepo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613df89bb1f05---salodibunuzegulazuvose.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/69624267700.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bigubuzojilubedarar.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xivoxu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/zejujiwes.pdfIn PDF document text
    • https://o-dance.com/upload/files/64579629668.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/25335089207.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/tenibarumojudozuxa.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308982745283.pdfIn PDF document text
    • http://lgassociates.in/uploads/57981183860.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/75444312182.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/19450661197.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/84501637318.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/62051791495.pdfIn PDF document text
    • http://yoron.net/up/files/mefabalimofibizosupuxizo.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kokozedewux.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-7/20210907083720157697.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_off000180f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F0 10044 bytes
SHA-256: a423a8e577330d3251674c08dcaa9eb6f8931b23eea763f126d1be6b78c0fa34
font_01_sfnt_off0001975c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1975C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF6E 21092 bytes
SHA-256: c26dc7387c5b920443b7e499428db1303b7e41384ee285c7d9697acf08185fba