Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7019627ef9f4c86…

MALICIOUS

PDF

90.6 KB Created: 2021-09-08 21:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1f47e64bfdd733ed97d8cbd286cfb12 SHA-1: 6bbeb17bf82bec47c8f46b8f657cc874e5505377 SHA-256: e7019627ef9f4c86b011bf9be3765d30468a98e06072a7d4df02d0d89d36d071
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The heuristic analysis indicates the document functions as a link farm, directing users to numerous disposable domains, one of which is explicitly flagged as such. While no scripts were directly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics suggests the document is designed to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://bliznacite.dvsportbg.com/files/lenamodamisipunebijo.pdf In PDF document text
    • http://ltptech.vn/uploads/userfiles/file/38736310546.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/87230380846.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/80275824350.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/vukoz.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109080712417752.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lopofaxaguvedovawiwavum.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/47466566996.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/93628360843.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/86312623621.pdfIn PDF document text
    • http://ducnhua.com/upload/files/ludetazoriliwik.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/femomaxukoxusufa.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/28703547185.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331c99878a3---78134663311.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/99552226818.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/dejewovijebojo.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/258287220.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/13837587872.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89982472039.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c30e51bc1---datop.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/4771275210.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/ledeburovunatagawobi.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/9756679867.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/tupabadasodanofowudufuto.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210908162234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=curriculum+vitae+europeo+pdf+esempioPDF 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_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 10876 bytes
SHA-256: 1cc4ccc1658172ae3684d5869574060d3f09f624a3acbef47aec02c6a2921547
font_01_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 18164 bytes
SHA-256: 341242777be2ed22b6aa24d3d290816abff0353aea1fa437496905c12100e02c
font_02_sfnt_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1