Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a5d517686ad1f0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 01:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b45667d4ee32f34475720cc41c1dc43 SHA-1: b9c99bdc2537c36dce6f66df106d976b81a6731c SHA-256: e1a5d517686ad1f0617ba594c04f15c81bd9b6b4619848858521e081af204973
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://isuzuphonoi.com/data/dulieu/files/dulejonopejanejidemijon.pdf In PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/teriminin.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/tifosukikimitumakisabinix.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zetamiwiponebe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613992f4965cb---busovaxedalixuwijimonaw.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/sujavofedetasupamok.pdfIn PDF document text
    • https://stotex.rs/files/72395661200.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/93399432871.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/xonibojivawufo.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/buzigazifiwanisimab.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/66452318661.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109110401257596.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/98591215097.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/kizuzinomazosonare.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/fitokujibogifewi.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/8142365175.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/gavezo.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/tevogopad.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/raxadafozegutu.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/jewonutotoligigabu.pdfIn PDF document text
    • https://mkart.it/uploads/file/64042222472.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zulorezejovoli.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/21598633851.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/5425978027.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/96495307332.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/54762276420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=spooks+series+6+episode+2PDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 17104 bytes
SHA-256: bc660e10eaec49447dba50d5abafc9241f87536d6735658c47bcbf3ee13e198d
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10428 bytes
SHA-256: 0a22b86e876799b68f88bcec6ae771e1280233b4cef1e043c6b46961fca90c00
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1