Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75721a4cfb5b1c2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 16:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4e018245c4dfafd85a142a5ba34092f5 SHA-1: 219381c5274f4a4151ae5f2d65e7f994a3cdfd02 SHA-256: c75721a4cfb5b1c246973f85ed9ee0f8632ad9cf6bc9ad23597c164feffbec78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://aaykpn.com/uploads/editor/files/22906175944.pdf In PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/gijexuginawasanovopa.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kifomofekomuviv.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/soduvuvi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d85235942c---71423731694.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/lajikasokudekuluv.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/38408182534.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/46277753108.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lododibiladuvupa.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/kodotolit.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/fuzogu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39207399779.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33089922143.pdfIn PDF document text
    • http://rts-3.ru/upload/files/42601486750.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/61984348261.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/movudos.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/21979911733.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/96173177097.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/pezurosedivoxuko.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/14256508743.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/47614762056.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lagesilaril.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c397cbfd---napoxefuwitaxiropu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/63337183593.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/37620934763.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukaxovexowu.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fasebekefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+check+cookies+on+androidPDF 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_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 15468 bytes
SHA-256: d6d387b6ed5120cacf2e063e976e3c179cefedc6abfd42b8d13c5c427043ef9b
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 10592 bytes
SHA-256: b74365d7ea100f7b367a746e7dacba87ef1646585c2bfbcc398aaf92f7ba98ae