Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30fb9cc7044758a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 06:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d4454d854b06e1010b1a24838311068 SHA-1: 69771047d8270179adb042f3b0601c0b128823e4 SHA-256: a30fb9cc7044758a9099a2f3c3498882c721c6d622e530bf1a486c3a311431fa
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, one of which is associated with a WhatsApp download lure. The presence of embedded URIs and the overall structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=aplicacion+whatsapp+para+pc+windows+7+gratis+descargar+espa%C3%B1ol PDF link annotation
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tebuzufeni.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fajogotepiwewek.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/ranedesirogikosuli.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lexogomuzurozeraretora.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/97430361144.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/vadagutabikikoze.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/16804433667.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/kidufekawuvene.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zatalegegoxa.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/mivitezuz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614635c8beae6---gujutizaguvapovovifotu.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/43837346286.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/voneguluxikenilagimotam.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vikofota.pdfIn PDF document text
    • http://cortabellanews.com/userimages/7228426839.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fuvabakulafakabivewibov.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/bunipukugesuwabivokax.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/86072190444.pdfIn PDF document text
    • http://sdes.in/uploads/mibiraxanudelowamiw.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/8460790802.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///zimemezavijanuxefe.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/8423983290.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/37420767173.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vivewuxabama.pdfIn PDF document text
    • 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 17196 bytes
SHA-256: e433403282ea2790f553477196d6ac7efe1f2080a64f359f1eb722664211f039
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 11116 bytes
SHA-256: ffc29d554160b216ac583e36e86b09850cb0b7d97a13eac318621dbe5e200b5e