Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aebcb5e9f3fc8b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 16:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d06aeefc52d54f6bb26c27543ca23aee SHA-1: 16262e4e5e54acdcaeba9e0fb16c268948643bb0 SHA-256: 23aebcb5e9f3fc8b1bcee973548cdcd603a9dd66b3d49a0111cfd717cb516fc6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic for callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cx-gl.hu/images/files/zuboz.pdf In PDF document text
    • http://businessvaluationapp.com/fck_files/file/fujegilojuderodemov.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-1/20210901232011469031.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/13099710492.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/61885362029.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/84245256839.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/19476793892.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/3752971082.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/120957046077.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/65674741134.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fadufipezena.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/24526679170.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/erpjau5b5rn4tbi4ssk9s7u3l2/87368369538.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf28a6418---gowunoneb.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/fuxukodabibofafuwisuv.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109021447533651.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/xususi.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/86761260580.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/75451238315.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kibizogojumituzukukexi.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/ruduvobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+emulator+pc+downloadPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10672 bytes
SHA-256: 48ac6f51a132f02e1ddb43f4d41314128c894ed0975894dd1ae7c06afe32ade2
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 17336 bytes
SHA-256: 432b9ce1943d913655f1a480eafe8a60a366e2eed69aa81c4bb940a4bb28a37e
font_02_sfnt_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1