Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7d522cce26d461…

MALICIOUS

PDF

73.9 KB Created: 2021-10-18 13:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f1a3f1fa7321b13a6b57d345bae594c SHA-1: 7b945544102996887c919adbd7c3af2148535e07 SHA-256: fd7d522cce26d4617a0371a4165b27d29e5185f642f10685fa3f2832e8689e1c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://peiitw.com/Upload/ckeditor/files/tabobokesoziwatapuludepen.pdf In macro / runtime command snippet
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3e8eafe4---vitotadu.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ranuxufet.pdfIn PDF document text
    • http://kccegis.com/upfiles/content/file/20211001112550.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/6286176612.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/65953770589.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/dexoloniwuxadixazeseg.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h1k7q4oh3r2c96n5f0m5dncrd1/27841836937.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021101400425174.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/3560113688.pdfIn PDF document text
    • http://archbot.pl/files/file/tuboxodenawu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/36477508275.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/zajimiwex.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/pimejev.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/kimedisoj.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/49531315062.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/gagozabumilera.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jesawateveritiraledak.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/24656094999.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/99903971736.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/1681017909.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/1035955458.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/37239743505.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/27800839582.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bibusojilip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=bicep+curl+to+arnold+pressPDF 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_off0000bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 16048 bytes
SHA-256: e6b0fa7c952ce13633c0ae842d2f69092fe07a96ecc3b543424781a5bd6bcbdb
font_02_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10660 bytes
SHA-256: bd6c9036d8414357eb8886b6e01e5858e9d345c23e936c05a8fd34725caa2288