Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c992a9f14560ec…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 11:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0be68414bab115d5eda509ec4fa06edd SHA-1: 2b6a74201dbbd889ead9185736609722e80caf80 SHA-256: 53c992a9f14560ec0c9fa37d2e654c982a445af0db1a0d086c32f9ff99675d82
104 Risk Score

Malware Insights

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

The file is detected as a malicious PDF by ClamAV. It contains embedded JavaScript and a significant number of external URIs pointing to disposable domains, indicating a link farm designed to obscure the true destination. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3290

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://abwcockeysville.com/uploads/files/vezezokurew.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/maloxopafux.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lunokitap.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/36610746057.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/fopalovudim.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/kipopesilerorawuter.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/jikomadijoropizom.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/kimunagawuda.pdfIn PDF document text
    • https://brukspec.pl/upload/file/kizadodinadudusatu.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/44373212457.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/zurisudiwiporekapuno.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/velamuzixugujiw.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gumizijexujapofet.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/xaraxewigubajubapijibak.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/39519260178.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/34710435685.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/52213014415.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/jinaja.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/53554370093.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6345325---logoxaxipenonifurod.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/76142025741.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f32af0440---48835104539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=a+first+course+in+the+finite+element+method+6th+edition+solution+manual+pdfPDF link annotation
    • 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 11136 bytes
SHA-256: 6bc2360de93e89937b654fef03bab9f2d67d607951d535099b6de2237df684c9
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 19976 bytes
SHA-256: 7b0b3691fe5e26bdd038e7982bac6b8744a53d41e8ca86bec677a443bd57afc0
font_02_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.