Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e77dcd00d822ea…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 18:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 852a5403d4d57073cafe63a3d096b526 SHA-1: 0abc400d662b71f5cdd0fafbefde6447e5eee690 SHA-256: d8e77dcd00d822ea9bafbd6f8b12692c569bfbfdde60f753b75f04c6e8ab5dbc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external documents, many of which are hosted on potentially disposable domains, suggesting a link farm for obfuscation. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick the user into downloading a password-protected archive, a common tactic to bypass security filters. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://stlukesfp.org/ckfinder/userfiles/files/32978609364.pdf In PDF document text
    • http://canadianartistic.com/userfiles/file/35827514876.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/xijodarojigunaripakuzal.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/77842045549.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/lemadorawelero.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/14139573657.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/18793092607.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/86451397670.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161365014ba981---wulakujorunogipedofigigor.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/pafokiva.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/94206946742.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/dalujuriwejenosumiziri.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/jovabozora.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/fazefabefeweb.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/kigujebadekuk.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xotobamitajovexosugagaz.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/wagoxeluw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134060c2033e---46588701414.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rumojiv.pdfIn PDF document text
    • https://vleek.com/uploads/files/9508000329.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/gavinoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=local+literature+about+online+games+in+the+philippines+pdfPDF 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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 18360 bytes
SHA-256: 18fbdb87072ce009a0787c83fdc46f7fd9f69e41bba433552fba2bad8d445838
font_01_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 11264 bytes
SHA-256: 147f9e5747878310b86c42b461393e446ee4a2830672f2b01485933779867450
font_02_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1