Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38d1d04698d7b3a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 20:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82bb77019d46b60bd50af1a838a3c34f SHA-1: 36d511013469aaf6700eeef8cb33cc33f6788fd2 SHA-256: a38d1d04698d7b3a7ae4d306597f8940cbff8bfbdab7937d61c5ec2f0489be96
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://bestbelly.org/content/files/files/piwonilarisijuruguwinelor.pdf In PDF document text
    • https://fenixfalt.com/userfiles/file/20969696620.pdfIn PDF document text
    • http://4bx.pl/public/file/79694330071.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/50259030817.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kiligeremilulitow.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/dokevaguma.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/29314510745.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/nalanoz.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/nusiriwidakimizuwe.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901051851107997.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xaxokedujasinexeb.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/54119826445.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/45420538839.pdfIn PDF document text
    • https://palet-school.com/files/files/figexixenakoripibutafojim.pdfIn PDF document text
    • http://sbairs.com/datas/files/sewozopopena.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wazazeku.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/28397030105.pdfIn PDF document text
    • http://nemochem.cn/upload/files/jevuxawefuxatukuloxej.pdfIn PDF document text
    • https://ksboutlet.com/file/files/sakegefazugojoxa.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/50882662674.pdfIn PDF document text
    • https://phuquiland.com/upload/files/fatuzidasituz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+block+a+particular+website+in+chromePDF 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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 17756 bytes
SHA-256: 70dd03e58aa7a21ff895351849ac2d1df129c86a813659baf9462457c338e5ee
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 11048 bytes
SHA-256: 430b257ef9790f341e538722444f6a2b591e9808e968379c35ccc0cd4242a1d3

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