Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6acb3278b71165…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 18:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90ce8662e7fb9d9a28d7be36c8d896d2 SHA-1: ff9b92069d1291b8852dac2fe5b016dd4ec930a6 SHA-256: da6acb3278b7116574f2ba363bbd477711a4a4e8d23bf67b5caf753c1920abc2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or redirection attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into clicking a link. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pharma-tools.eu/galeria/file/bogunugidijimekesokupaban.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161357b8803524---kobunada.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/408c884e9cc0c3a2dbe951f2114d9217/62924147585.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/42379025825.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/34484536723.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/23619255839.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/97166625757.pdfIn PDF document text
    • http://hingliltd.com/userfiles/fodafuper.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/36012744807.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/41994877821.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/9612344420.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/41446312353.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vatijutemefetirav.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/69441203642.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lazududolomawulodexusuvom.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/95000816914.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/14915121231.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61044864847.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/bepowip.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/85709850662.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85626413086.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/teguxun.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/roxuvulewif.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/66567230799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=debonair+magazine+may+2018+downloadPDF 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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 11228 bytes
SHA-256: 02bb4bc459d682f64525afac2bcf4047a2568ea9c540de51cfa802e8873f0a92
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 18424 bytes
SHA-256: 9446abad3bc8c63b489821d39314fcd17d37a08cdcf36e141e2b30a0b08d6a32
font_02_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1