Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9eb068e6c82b00c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 05:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3459a7b5bd6c46f7174c9762331a56bf SHA-1: 00b9e0a29e54c8ffbd575653db2d54ba51c4c8d5 SHA-256: c9eb068e6c82b00cf98972eeb9871c8b86dd129b699eaf581ea908f47545d9f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing campaign, likely using embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://elitvorota.ru/f/file/sarenimilurajedixurem.pdf In PDF document text
    • http://ledseoul.com/userData/board/file/wowelikukubosipude.pdfIn PDF document text
    • https://titishop.co/upload/files/95033920671.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zosiniv.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/70673622008.pdfIn PDF document text
    • https://renetravel.ro/images/files/95794047907.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/vimadowo.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/xupinisav.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/19708387592.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/34565319812.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/wogedejupodegesutaseloro.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/wagugepudu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/68043002518.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/535733557.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/sijadoralevafotudemeraku.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/38163378063.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/21565708091.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/fufireduki.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/25225953912.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/25750346252.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zazoselila.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/47778087641.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/bivofafula.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/75931990205.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+android+email+app+for+tabletsPDF 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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 16800 bytes
SHA-256: 3ee4306cb4b86bd3248421c3ae3b22592558bd87072ac4c3724c75865bc8b20d
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 10852 bytes
SHA-256: c92c421a80240ac6e07f9aaf9da084bbb987d486a976bb094e9d1aaa4a693a71