Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af50c1f62433fee…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 09:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27b65a333556c6be9d023072cf48d028 SHA-1: c7bc62adec009b7b74239bdb785720cb257a56ce SHA-256: 7af50c1f62433fee683b6139983c34823d3642e9ab3f7c3d142d75184787cf5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=can+people+see+who+viewed+their+instagram PDF link annotation
    • https://mangallagn.com/images/file/fojazumomaxoz.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/1320103528.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/wojifodalo.pdfIn PDF document text
    • https://buka.ru/sadm_files/51550085158.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/gefaxosufaru.pdfIn PDF document text
    • http://www.perlodrink.com/documents/sajirekepezagewoto.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/poxajun.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/finudokudo.pdfIn PDF document text
    • https://n-tlg.com/files/file/fosawupajozemawubunesod.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/89680113101.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xogatokuxulipez.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b7477482ab18c8b0f3aed6f46168d4a6/62817248460.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/fedumu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/44263375041.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zanib.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/wufaruganugexipiro.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912224739.pdfIn PDF document text
    • http://fitviewer.de/files/file/wawuwapezavow.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/dixugijawodolinobok.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/23186186295.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/62144189246.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/47522025380.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2d3409b36fdaa654775924132fa18424/41076748059.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/22750883492.pdfIn 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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 11020 bytes
SHA-256: faa8509c37f190c86c76c9f87542000930a8b2278e11444b9df3db9c425b6e4e
font_02_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 18416 bytes
SHA-256: 4bd35e4e4d40ca254c9f4974bd7c6a71c99bd0d8c743f0e42573a59e67d5e44a

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