Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3fcb339d5e5a8f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-22 11:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c57a7c9818e51d2a2ea6acb55c9bd29 SHA-1: 16e2689653daae6dd4dd34683be893c056690bdb SHA-256: 2d3fcb339d5e5a8fc93f7f75c1b383c5752fd009160995d128561b92eed62e2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://neonatal-surgery.ru/userfiles/files/sigebejudiwuditetemowu.pdf In PDF document text
    • https://jjpremiers.com/files/87644530663.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/jeloxafoletenusojoziduta.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/11628152334.pdfIn PDF document text
    • http://101balkon.ru/upload/files/xowidejex.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/52236133667.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/60519884422.pdfIn PDF document text
    • https://ntc-container.com/upload/files/69328874900.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/denafuvomubogozo.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219221429454914.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210914_D0BE93A6D7E267BB.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/87066090198.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/nosepi.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/38912455434.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/doteved.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/83932856895.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/bukelameserolesiruwa.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/belosupux.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/zomobererurefamilubevep.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fubeneg.pdfIn PDF document text
    • https://stormester.no/files/file/pejuwoxosuvuxinuxolade.pdfIn PDF document text
    • http://schokofontaenen.de/idata/7175367561.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a1e242946---gezawewatoxekoluli.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443e70a8e57---91140068835.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/bowowuzoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sulthan+movie+watch+online+tamilPDF 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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 16880 bytes
SHA-256: 3b81194783e2873c07686f369031703c9025e1158734ffc14c29c6b988324170
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 10556 bytes
SHA-256: 16e8c0e205ad5dd8e31cf6711117862b107d899499ede0d509e151c6846a981a
font_02_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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