Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4524d7f366615e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b320c08e2ba613ac2f02b419f8dc2f0 SHA-1: 23660c6466646f6c21e341a3231f9d0622976998 SHA-256: 4a4524d7f366615e44290063043ad933c9f34bfabd802954b44e6a1801c633c4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it is a link farm and a callback phishing lure, prompting the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://velapower.com/glwh/UploadFile/file/2021091607294973499.pdf In PDF document text
    • https://promobryansk.ru/userfiles/files/35817840622.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/37418681355.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/48562984433.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/lunazodidaxenesawo.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/68426999475.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65940188588.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/kamaneremopo.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/foxexubitopepukumijon.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112a81069b---68016325186.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/sinemoxoz.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/75498743362.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/57176512876.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/52826432147.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/67611194005.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210913110330.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210912/file/80275190720.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/dopurigi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kesibiketo.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nozavoridizanumiwusuji.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/7100400921.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614690ddc35ce---92006848415.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/62382188561.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/besusixewadumuselolod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+wont+games+install+on+my+phonePDF 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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 10792 bytes
SHA-256: f849a7cfee3fe1cac366f2b0d1a50adefa377959d450decc1b77458907a36c22
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 18408 bytes
SHA-256: b18e08a8242d7e3b02441bd8c8b43ded859fa54a583fbce4e38a98a471d5ca86
font_02_sfnt_off00012866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1