Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d45989aac262bc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 11:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8a75b59c69df6ef9cc0c36e80c7ff6c SHA-1: 79c426091a6ee7ffb9e2564a6cddcb0c8461a59a SHA-256: d1d45989aac262bc3239098525759a368f8c3e428d7bfd17422e9790598e1e53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=mixing+what+colors+make+orange PDF link annotation
    • http://wijnhuis-vaessen.nl/site/data/ws/files/pipev.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/29678148833.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/misavovufefejirufatore.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/59239420404.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/60704541973.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/putoxixeb.pdfIn PDF document text
    • http://osayit.com/images/file/58870248515.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/58985164147.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/getebetiteroxapebelabege.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f5b70e2e---rimagufebebifozis.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/69232118567.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/65997986338.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907183821.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210908_025242.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/bizosaporabu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/nesorodokonesetijufa.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/xevupezewumibatenido.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378df6e3a3d---50233046159.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/98919068115.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/fawifunixivipibavaxa.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/vapubivemevumizenaro.pdfIn PDF document text
    • http://4darchitecture.org/img/all/65192841472.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/dewosilinala.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/38951431880.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/46192416870.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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 17452 bytes
SHA-256: 4657f4836da694cc24287203dd6ba399fb97b4aceaa0734a463140d528ebb744
font_01_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 10948 bytes
SHA-256: ee6a760663a70430dc0800c8abfb1a1ade0606721b1f7c2035d456ffbe6dfb7b
font_02_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1