Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7020a15d8a88f87…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 08:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1d695902b984d67efef17ccef92ce95 SHA-1: 67972ff89a4f8981858dfa3afe505b2a32835f64 SHA-256: e7020a15d8a88f87a9a06873c03b6fe8384113164afc51d67dfc1737a8fce2a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document as a link farm on disposable hosting, indicating a malicious intent to redirect users. No scripts were extracted, but the presence of many external URIs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=lords+mobile+latest+mod+apk PDF link annotation
    • https://shih-tzu.ro/files/file/nipasonuzerukonudodobob.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/gumosulamebezimi.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/roliwuk.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421aaa3dd08---ladajejit.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210922151916_tvu1zh.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/83101473739.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wopixiruxalapikif.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/70550808429.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/23909206882.pdfIn PDF document text
    • http://acelybio.com/upload/files/fuxaxexapujefopenozugaj.pdfIn PDF document text
    • http://mfahk.com/upload/files/fitumilufina.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/busax.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jozufunu.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/perinobafejolupavopuw.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/teligufemalikofebapuva.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/84647204702.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/99741328348.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/tedini.pdfIn PDF document text
    • http://langyupharm.com/upload/files/22123065503.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/suzala.pdfIn PDF document text
    • https://chptravel.ir/data/file/tilowutanumedo.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/21008829421.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/zemonetalejejawilazurida.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/31636412865.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/76831711757.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139140de2763---fisavelagosolizesinulok.pdfIn PDF document text
    • http://cutskytools.com/d/files/17562299220.pdfIn PDF document text
    • 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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 15896 bytes
SHA-256: 20c8c43b4f5be31c31a97412469c2df3bc3a7c247367dab7d67536cf5aa3b882
font_02_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10640 bytes
SHA-256: fa4a10a4e94fa9177bd883c84bdb133f778aadd39231bf48fdb25f51aa0964cb