Malicious PDF — malware analysis report

Static analysis result for SHA-256 932aecc59ab21355…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 22:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82fc13c89fd4ccef4375b3d4c1bacce9 SHA-1: e5615555b1be133239b8a86e168b54bcde8f372d SHA-256: 932aecc59ab2135560c9fad04fe226ee2ab37aea27dabba701b9048cf0acb5e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, and multiple external URIs were extracted, including one with a search term suggesting a lure for 'among us cheat downloads'. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the overall heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=among+us+download+cheat PDF link annotation
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/10157920927.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/966473764.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vaken.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/mupivefuvux.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/81784937119.pdfIn PDF document text
    • http://dd-eng.com/files/files/75022482674.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/46005939778.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_115403.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rotugukijuxokenis.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/69825107016.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zuzivibifefuxonosawetulo.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/dovenitodavixovi.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/61689376094.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95538695603.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/gapefinonede.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/wutuxezogitoduvofe.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/31048443126.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/80935098677.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/fawulevojulor.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/9573187170.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4c869a992d895edb53a0528b82bdc020/84732687653.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/46092143760.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/89681039744.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_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 10792 bytes
SHA-256: 45777eef62031004c2ed30c69581af650df8e52f3c16f47fad23c8335d0b1c63
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16948 bytes
SHA-256: c190621fb563e444f74b830fa1b1cd62b8f7fff2487287cd7a2497962e7cbc55