Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd144bac2d76427…

MALICIOUS

PDF

86.2 KB Created: 2021-10-27 15:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 057abd39ffbf2a8eb8c62987c2201d6c SHA-1: 12183caa6ffd37fe3e779d48a0540882582d2823 SHA-256: 3dd144bac2d76427e39c7618b5afed13512b4059fc86ccce56dc9448db7ff4ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://boek.se/bilder_umeny/File/1143564081.pdf In PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/wukemejemakuwolowa.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/nufisulikir.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/65946946078.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zexifif.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/fixaxozovoxemefi.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/71140279132.pdfIn PDF document text
    • http://zzweien.com/d/files/xagexagerizekuterakori.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/xiberef.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/gemegevevasorefuvazomeleb.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/67077604231.pdfIn PDF document text
    • http://intertravel.hu/_user/file/nogesezinudepelir.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/mavezosimunerojufuwu.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/6163718994.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/wagidotevixamovego.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/67298502253.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/6925083653.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/vovupatom.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/ditozojobokanog.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210920184709.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/nomorasekorasuwisotola.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/fewotobefubibitazut.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/39626195182.pdfIn PDF document text
    • http://splogservice.ru/content/files/jazujuvolisutafijutorote.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=test+the+convergence+of+the+following+seriesPDF 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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 17940 bytes
SHA-256: 27aea779fa5c8b83047bb5972e17995749891ae91e71e68f27430788a2d1a33d
font_01_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 10568 bytes
SHA-256: 9adb9699884545ef41d6e3ca831b739196cb96440fa5bf73e2d318d80ee1af5e
font_02_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1