Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f42a9663b8dcb0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 13:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 45ad3c9ac6f9bc3c44ea11741abb4a6d SHA-1: 52e466176cc6eb77b173c968333af04b791eed1f SHA-256: 72f42a9663b8dcb086af84879310fa16352bdb851339f8d8b50679736ceb42ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the presence of external URIs and the overall heuristic profile suggest the PDF is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medizator.ru/ckfinder/userfiles/files/92153423407.pdf In PDF document text
    • https://mywayrtk.com/userfiles/file/7785385911.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83438311964.pdfIn PDF document text
    • https://gencatakan.com/upload/file/zinowegumafejazasonakep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141622771371---84195386296.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xevofu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/75982587243.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/kinad.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/91155141035.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vigagilekoxuna.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tilibemin.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cf2a18f5---30580306320.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/pemiza.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///60755037669.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/fivonij.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/rawimenuwuporebasiwaze.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zimelogolawavawigurep.pdfIn PDF document text
    • http://huntland.hu/upload/file/vivodetufuvo.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gafoxuxize.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/65820406606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=effects+of+eye+contact+in+communicationPDF 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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 15988 bytes
SHA-256: 7aece43ad1b71b54dddfe631f2a90003a4b1acc8ef13541da06778e6226d4be5
font_01_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 10548 bytes
SHA-256: 8afa29864e180c06eddf0cedb159616838bfa046de726d004134040ae786f183
font_02_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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