Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68e4e1612b45eea…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 03:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9f77775bbb7fbadca026f8f0b77393a SHA-1: a9dbcd53391cc100535dbbc6601fa569b7db61f0 SHA-256: d68e4e1612b45eea570c3865a7c0fbc532815addcf69cb87c4c1d8b9817c4f36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=envision+algebra+2+answer+key+pdf+additional+practice PDF link annotation
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/velifezebilarivadadolon.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/59870820676.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jebirojosobibubexaberej.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/58077193466.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/tujugikatepadivovunalire.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/50913260843.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/79225449329.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/47011070959.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/banetipado.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jugize.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rifopibukabi.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/80117511936.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/80776643428.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/sovonowomag.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lopexajaxakodojasonozafi.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/92888706034.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/88783813550.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/48563516660.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/zazokokirojunulezowivab.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-26/20210926075819244808.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4b06cacf---gomalafajomu.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/52425569252.pdfIn PDF document text
    • http://centronegozi.com/public/jexolemilorukefafirebel.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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 11396 bytes
SHA-256: 2bc8d4324b98af0a3b7d203845e205b042f9d171148d621aeda9778c838d57a8
font_01_sfnt_off0000cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 16008 bytes
SHA-256: 75dfc56333cd17df115a1956a2277bc1c20079fa93789488b6ebd5f86fa150bd
font_02_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1