Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73667f6d5df296c…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7c13c3882ac0a1d3e4dc77cfa0bf443a SHA-1: 0c75885893204cc99f447c1ace7e7ce12e094b0b SHA-256: d73667f6d5df296cde19c71b9cf090adee1875269992399a2571feaf1fa9275e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links point to a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=sega+heroes+cheat+engine PDF link annotation
    • https://muzamurariwuf.weebly.com/uploads/1/3/1/6/131636995/bc92e421.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/sixubika-romojovobu-bonemiloginimup-titunu.pdfIn PDF document text
    • http://dsv-trening.ru/fijolopagonavixozavuligtham.pdfIn PDF document text
    • http://fiwazurenorin.iblogger.org/3136353809.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/43ddfe3.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/8932812.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/ginov_galamepoludup_tegonoga.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/gguEqd8/35042277737.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/Q9tihih/29432383334.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/ghf37gg/89196393070.pdfIn PDF document text
    • http://flipping-car.online/50342828262v75np.pdfIn PDF document text
    • http://biolinkus.me/revowebo52b8r.pdfIn PDF document text
    • http://sovadarasuzepa.iblogger.org/2225782256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/is_murgee_auto_clicker_a_virus.pdfIn PDF document text
    • http://pobevejilu.rf.gd/sofia_bulgaria_map.pdfIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_8970f1960627496fa91f5cde532b9a13.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_0cce3e17a1fb4de0a1ee472fad326230.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_f9ad1b7876294fef91555bda10730d9d.pdf?index=trueIn PDF document text
    • http://mubomapobe.epizy.com/wuripoxo.pdfIn PDF document text
    • http://dukoloxanad.epizy.com/7800276168.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/auditing_books_for_b._com.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://scripts.sil.org/OFLIn 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 5132 bytes
SHA-256: ea3a7f01d223d5a6a52a4246ee12bf0eacc8d3440a43832cc4f410a103f3be16
font_01_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 12024 bytes
SHA-256: 291e5784aca55250d959e0a1790b2273b8fa8b672aace24410254296dc264767
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16080 bytes
SHA-256: 28d5afbff6c2e9e687c0d9657fc0c8653379f131105490b33dc0c12c71f72ad8