Malicious PDF — malware analysis report

Static analysis result for SHA-256 331d3ebee182c7cc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 13:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c781433b95bb6fa2d4c20d031a743c45 SHA-1: a88b76a2c982afab5759f999d102d8e065368eae SHA-256: 331d3ebee182c7cc8933c1bf66c104b099451c581e9d9d8e0ad2e7b7078aff31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://catamma.ru/uplcv?utm_term=php+net+manual+install PDF link annotation
    • https://esprimagroup.com/userfiles/file/dosonireloraxisafetonive.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/99833759950.pdfIn PDF document text
    • http://actinq.nl/upload/file/zutewejisokerewawej.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1397d7fab---befililuzo.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/49935369798.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/51458429243.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/72116645321.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fajugusevobejupasakujev.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/16932692455.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/29979491348.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631059819/file/zetimatebewita.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/62075461040.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/fixiwas.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210906_8C951D47E3D83360.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f84ab27ec---nijogeredirujovituwejakax.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xibenajewetifek.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/xewifiguditizulenaritod.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/92939320694.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210907230615_2018641474.pdfIn PDF document text
    • 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_off0000b9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AC 10400 bytes
SHA-256: 118dfceabbd0a1e78a03d434d01a9890e17bbce4d803df4fefd365a7032db1f6
font_01_sfnt_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 16660 bytes
SHA-256: 9885f57e5a96aa62f8b28e1839882d3da4785d955f270d97f971df3959d0465e

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