Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b09914f4cf4219…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 00:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92af9deb0debbf0840ad5a68daf56356 SHA-1: 87e4b497f27d2a0ba577f6e1b7e60276a04c34aa SHA-256: 99b09914f4cf421947d53ee51f5df96f124e3106570a5405bdd0e722607b78f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and a ML classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous embedded URLs, including one pointing to 'garglob.ru' with a query parameter suggesting a lure for online content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or malicious redirection intent. No scripts were extracted, but the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=friends+season+4+episode+13+watch+online PDF link annotation
    • http://apsara.ru/userfiles/file/resuvugoguz.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/bekobobe.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/59860320240.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/mamafekifijikeduve.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902234940.pdfIn PDF document text
    • https://bagstyle.uz/images/file/12840238477.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/miniwatolomifazufuxobojog.pdfIn PDF document text
    • https://abss.pt/userfiles/file/toxoxu.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/duzimorug.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/igrl84uatr7sgch4ghpjn35am0/vuralojaridelet.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/5303854650.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/2322982102.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/23984646153.pdfIn PDF document text
    • http://nincity.de/inline/file/69698063625.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pifagin.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/19653859684.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pilibefekotedimisudufofi.pdfIn PDF document text
    • https://mavibusiness.it/file/2380505067.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/34585883048.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/2782234070.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/fojibebozamunotewe.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/paseze.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 17872 bytes
SHA-256: 60b3b58a5ef021555484a9b67ff9e7aea38bcaeff24baa69edce090b4db73329
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 10976 bytes
SHA-256: 20416185f95ff10d6db751a4fc9078d4b1b5b4644ef28d10f8d4d18c56dea1ea

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