Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac7063835893df9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 13:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a7fe2aadc824de3c0b5d8a0258e58045 SHA-1: 255d7e67beea6d64d6d33faa9c92d3db5f2cdfc2 SHA-256: 8ac7063835893df9b35d177fdacb0341999ac2ca68a1ea2da10e6dd1e8c1d51a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kingtonkatsu.com/uploads/files/xafovanif.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16133241a711ad---pazililoxorilemazul.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/fesaloxokonudaroxaf.pdfIn PDF document text
    • http://runhouchem.com/upload/files/68577674695.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/nakekutobililaxa.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/jelalivolakuju.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fq2tnib1d104mtffan1g1eiub4/kovezikozuwekijujoniw.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/lovajizolorerakuguvojig.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/71866522937.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dibeburadibu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/99640512174.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/92280137565.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/82965514644.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/46751991465.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/16495635863.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/5571460276.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/puxujomovesogudabijet.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/taropujadokirubot.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/zixitapixiripa.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/1114737162.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/jajifilubol.pdfIn PDF document text
    • http://htygroup.com/upload/files/11570877838.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/vifarolowukekesubenu.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/66409911776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=antivirus+for+windows+xp+32+bit+offline+installerPDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 18296 bytes
SHA-256: c232043a88169c7c402360b77e5c32fc3b6c623092ac1596686235b7d4fe1755
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 11260 bytes
SHA-256: afff65fec78acedf88f84620534e2e3fab395cf12af7fedb0dba1995d066686b