Malicious PDF — malware analysis report

Static analysis result for SHA-256 954aabfc9ac046c1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 23:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9bdd394f456ffe83859599a4e76648d SHA-1: 37ebed29e8091d084b9f8b49888205cb4a000a43 SHA-256: 954aabfc9ac046c1864e42ec15461acef9bfc2ecfc231a057cd9c4197c6e1cd1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 http://www.ap-arte.ro/fckupload/file/jusuposulemenexukexabofen.pdf In PDF document text
    • http://noahmission.org/dataroom/file/jevitu.pdfIn PDF document text
    • https://togeltop.net/contents/files/wiwutofimisomiriduzuso.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/votab.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/noramo.pdfIn PDF document text
    • https://endobible.com/userfiles/file/satekozow.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83872242088.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/4820170894.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/44113519811.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/buxazopadogunati.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/rivolosedijodujabikirujo.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/21883761427.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109120102446380.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/14eb866f8a335acc8cce4a747819f047/zubejunuxokuzidoduk.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/pazifez.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/33777118540.pdfIn PDF document text
    • http://contua.org/userfiles/file/ragedi.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/70912509245.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/59630543527.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/3351210119.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/rusiwalojinomunarap.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/tofigi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c32660b00dd9dd208988e35987d198e/21906026545.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/zidanugopilebuzodiwafufu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/73045492379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tampermonkey+scripts+krunkerPDF 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_off0000af80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF80 10756 bytes
SHA-256: 7522e1396c996b9f8263ea8cce3e5bdf72126e6b823be455e703cd6d516d3c86
font_01_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 15048 bytes
SHA-256: fc66313990094ec139bd14ef8d9919b58a0c146606e61f33867a8c7088a99f70