Malicious PDF — malware analysis report

Static analysis result for SHA-256 771fcc63d42e6230…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 15:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3de09c92f70fb45db2589bef554ff3a0 SHA-1: 77314d244eed02bf16546c408f98b340b98c3c71 SHA-256: 771fcc63d42e6230b97ea1de84c2c34a2ff1b02cfa93460c96ae931f4282e384
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://egyediajandekotletek.hu/mvc/userfiles/file/98557740024.pdf In PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/bivadikotulon.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/8980501118.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/doguwapilubajedivasif.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/30212409540.pdfIn PDF document text
    • http://lex.tj/img/file/66120615829.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/38777447738.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22469467060.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/64408960979.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/dipoxokoteneba.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/20884784885.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/roraginemosanebavopad.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/daxajodi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382819b16c6---xemasenetukagutunuse.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6b078224cadef4e1766135dbcee2aed4/26391099867.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68766662248.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/60747181657.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/95444533201.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/vufoxixurivudeja.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/11820831834.pdfIn PDF document text
    • https://ms01bet.net/contents/files/raviwapope.pdfIn PDF document text
    • https://magerp.org/upload/files/soxebajorifono.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/8829601138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pengertian+ulama+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/14402313693.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_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 10656 bytes
SHA-256: dbd69a0ca833eaa00cc9fb164e7ed56bdca485d5078ba77d0ac1c2eb4160fa38
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 19804 bytes
SHA-256: e11efc4032d6da8259fd7d7f379a0a23077826dbce30db34e85e10c5a94c78c1