Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdc7eb49d81109a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 06:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3bc2a00157a6b817b1dd7645d1bb4c0a SHA-1: e2a967a860c702f877617799e2f137ba61947627 SHA-256: 8bdc7eb49d81109a0590775882b70ff6979b7a9629677d9c068df54a87dfa5ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The embedded JavaScript likely facilitates redirection to malicious external sites, as suggested by the numerous unknown-reputation URLs found within the document. This pattern is consistent with phishing or malware delivery campaigns.

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://principesgs.com/userfiles/file/vugoponadisoruzofa.pdf In PDF document text
    • https://sanidom.pl/img/file/60768334431.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/regofefafemujozadezuwuniv.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109200238501093.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/pesiduwatemixadazetor.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/gezukogemiza.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/44435725654.pdfIn PDF document text
    • http://perksys.com/userfiles/file/tutofarovuvuju.pdfIn PDF document text
    • http://bibikid.ru/upload/68663155520.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/66234428002.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/97314060275.pdfIn PDF document text
    • http://cl-pub.com/files/files/96776061515.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/zazarejafikivosi.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/kugoxisixova.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/pudazawawagirejitodeg.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/59524886503.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/kimiripokiwawanidemapuwo.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/rofazisa.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/98989152195.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/96426242367.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/93975663677.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/56855637378.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/84101983146.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/30111604397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+flying+apps+for+androidPDF 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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 10840 bytes
SHA-256: ca508bb01bc13703a22e309ca86bba6c80383339dae355cba183dad17bf9efab
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 17028 bytes
SHA-256: 444b79ba4170f6028add8a443d41914596b2118eef724645ac554fb79abc6d6e

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