Malicious PDF — malware analysis report

Static analysis result for SHA-256 8379c1fb26e2db09…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 18:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c118deeed3a26f3f9acf45716c1b77ff SHA-1: 0d63b0ea4da5f17ff32e74c9fd10bdaed4058dc1 SHA-256: 8379c1fb26e2db095fc86d6bba9395c21558aaacf2b86ec0b22ecbf2aa70684e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://vitanov.rs/files/11744933655.pdf In PDF document text
    • http://ksnjl.com/userfiles/files/batelar.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/15998057101.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/nazofuwogu.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/28416012391.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/lupakedisotelijamim.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/26054713655.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/gavepewiwetukeb.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/91033261240.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nobuzewabuw.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/97802009676.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/93557916619.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631220493566983428.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/6540628406.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/27555457339.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614070bf209e9---dawiwunejomadajunenimoni.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/16345691101.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xilun.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ee905d4c---1545988088.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/20329075491.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/metegofopagunoxazubarugak.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/28698953703.pdfIn PDF document text
    • http://swhos.com/upload/files/72996020473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chal+mera+putt+movie+downloadPDF 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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10772 bytes
SHA-256: 2f25d920d6011ab57d5c2232cfae2e9225d5c78cb36ade1de767d1a654170271
font_02_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 17528 bytes
SHA-256: 25bc77c83ed312689ee3aaea6bb689909723e0c5fd7e15ed049c2cad9cda4ae3