Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33d5909aa265358…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 11:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ccf96932f8f06a4d2f782b2f732eefa SHA-1: f809a53af812e63ec65499c0553ef810b1f72f53 SHA-256: e33d5909aa26535804a5d45eb3eee7f074956111f61d1a606a248be2e4194496
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear disposable. The primary purpose seems to be directing users to these external sites, likely for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://jun-travel.com/userfiles/file/51051775766.pdf In PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/58108673305.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/23941184277.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/95329695508.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/3584838289.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/nazozijenunopapeja.pdfIn PDF document text
    • https://ubranni.com/uploader/files/13516159236.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/30120019325.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/binipomofanuresizuganakak.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/50595509716.pdfIn PDF document text
    • http://edeins.com/userfiles/file/69285434039.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/33810293812.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/4096035648.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/sujigezuxap.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/gupezexezesivepulamojaju.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/76866009927.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6de5693d2---24368733611.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/popisudezemixivukuz.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/20107893299.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sipoz.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/maxejosutobigiwe.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/84960050389.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/17202914831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=assive+touch+apkPDF 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_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 10460 bytes
SHA-256: d02ab2ad8c9592be4a9165371ec51321addc49846e9fc8176d4ce9be2de14421
font_01_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 16972 bytes
SHA-256: 1af1f2756913dd1f0f94b12cd55416b535c54e15f535ee73b41829096fd066c5

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