Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa87b285c87d595…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 01:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fa0a03174e62bc3e97e534c78f12be5 SHA-1: 8a96ec01a86d9de304a153f40685b79569b85360 SHA-256: faa87b285c87d59541641b15365db73dc8a5e8f3be52bc9727ab6893a077c7c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=website+to+find+textbooks+pdf PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/41e2d90f20ca784cb2c676491e1450ae/pubapufa.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/pilixesalasirelok.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/36040734967.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/48581770785.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/zufevaponurunix.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/mutaj.pdfIn PDF document text
    • http://cosyromania.com/media/file/67686804679.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/jixujaja.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/bapanamuvogep.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/95290286299.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/perifozixaxolavuxi.pdfIn PDF document text
    • https://alev.az/userfiles/file/488073551.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210916182911.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/gapelir.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/lifixesepetotefolad.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/95316522901.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/puzuwetogexikiwobatetap.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/badoje.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xakerumelave.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/99689477927.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vufotakisonuzidera.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/gomemobix.pdfIn PDF document text
    • https://5udua.com/contents/files/86604720714.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/96717992595.pdfIn PDF document text
    • http://inica.org/files/file///87673383489.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_off0000b5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 10508 bytes
SHA-256: c7a000dd588c8932a52dab8089f8b0d500701df5207da8f11694de013a040d17
font_02_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 16468 bytes
SHA-256: 6cd7a832709aee9df060c617c32bdd111c9ce4ec3fca68a34e69c2b93d232956