Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e78e92aa66907ec…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 03:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d02d8876d48abe062ddd13cd3732a4f SHA-1: 8705ef04bd01374d33404c70aaf04651120a0eac SHA-256: 1e78e92aa66907ecbacb90ad50ce3f8b4adef14e5ab0299110adcd1b26b38701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document functions as a link farm, directing users to potentially malicious sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://nadafashionbelt.com/Uploads/file/sadetonipokosobivu.pdf In PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/5538883943.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/tiretelarekikid.pdfIn PDF document text
    • https://izr.fr/files/19410507626.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/76704936981.pdfIn PDF document text
    • https://ip-pharma.net/data/files/wigepabaxetoli.pdfIn PDF document text
    • http://receptlap.hu/files/43595720449.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/79647344322.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/dulus.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/40542964456.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/49981799815.pdfIn PDF document text
    • https://equalland.com/uploads/File/4909045657.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/40778522811.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/vawakuba.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/bavejudowa.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/85385475684.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2752429958.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/26158854995.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/36098053608.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/32354267505.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332516e3bcb---70554481871.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/10044949663.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mozodorabipagubaguri.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/87446048549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tux+kart+androidPDF 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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 10152 bytes
SHA-256: 5b4366f60fd108ed9a0f0bfa8d89dfdf02361ddf9cdd8082bd70d2560b69eca2
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 19124 bytes
SHA-256: a58e12d3fe01b4aacc068568caa9d4093b086cb2c1828ed40dea8beadb481f50
font_02_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1