Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7b891b3d3a146c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 02:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89270a0bb2e680af01c01867735ea592 SHA-1: 8a37f6aeba989e5de48453e57e98428725de5975 SHA-256: 1e7b891b3d3a146c8c7d669f1a75ca8d81ad7804c7b5141fdeac6c4806184d62
126 Risk Score

Malware Insights

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

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 related to phishing or SEO poisoning to drive traffic to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://affordableadobe.com/ckfinder/userfiles/files/vegadujamavimikikaweva.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d83505b5---64625567107.pdfIn PDF document text
    • https://wita.lt/images/files/16250963752.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/jedodaxaxomumoradumu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/80229015944.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/jugapofimuguxu.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/77881307679.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/34979342903.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/gekafupiriri.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/4969173580.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/monewimegarulazuk.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/78272183071.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/goroketagafumamidez.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/52767124534.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/nafelatapu.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/80109456183.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/10084741128.pdfIn PDF document text
    • http://videlec.be/ressource/file/sulekekovoginuvelixa.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/51168728597.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3bdd845dc86f7bf787c9fa21f4761400/72358987758.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/62077692507.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/fubuxat.pdfIn PDF document text
    • https://betsin.org/userfiles/files/zifamoludi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+stop+games+from+stopping+music+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_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 11092 bytes
SHA-256: f8e2b5642d9bdfc3c6ada38e8db4f25fd0e6c06bf0d3cc70eb20df44d8160a98
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 18808 bytes
SHA-256: 5c19c27e66243ec8b2a7b1ee3221cd813424498e05928af61e0ae2caec6284c8
font_02_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1