Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2534e8a4578cb9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 21:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f21d1f4508ac2bfb31fe846d7eba427 SHA-1: d11046a2b31262a0611940714b52593d2a27899b SHA-256: db2534e8a4578cb943a8f7d38be37a479eb074881c937686ba533ab2b4d8bd23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical detection of 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, indicating potential for malicious scripting. The PDF also functions as a link farm, hosting a large number of external URIs across many distinct, potentially disposable hosts, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://logtech.cz/foto/Image/file/54200650423.pdf In PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/92508912575.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/2481283408.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/guzirabozudawomomozefelul.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/82502215036.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/11949773985.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/borerixalitemupanixoluzus.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05d990f93---mabijixogibesomivazaxuw.pdfIn PDF document text
    • http://creationart.hu/files/file/57892077795.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/78905709705.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/rutojiz.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/91777342684.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/puwonexugumive.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/28398718576.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23733083126.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a2c7176a2ac01acc835f146c6037edd8/lajatodonipumif.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/52553717568.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nesolanolurebimemujolo.pdfIn PDF document text
    • https://ccskin.com/geektic/files/72108087104.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/38610334973.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/tababopulo.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/diwoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=honkai+impact+3+sixth+serenade+guidePDF 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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 11372 bytes
SHA-256: eefdc6f4d6482dc38bf9884f82c9e683e5469bad5f30c27cc17c8d85329ef0b9
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 17744 bytes
SHA-256: 1f727139cf3bae537763d713454731e72c00961e7cd31c5c50af75cce9fa4fd1

Open this report in the interactive analyzer, or submit your own file for analysis.