Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f9b35ca6674814…

MALICIOUS

PDF

82.1 KB Created: 2021-02-21 10:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76d7a22997dedbe249d76fa8838809d8 SHA-1: 93a82b8c7d47b4d69eecc6d3d14d0197f10e07da SHA-256: e0f9b35ca66748143d61db45583338400611d87b8198c1fdba8e27c030cce184
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=flexor+tendon+power+legs+reviews PDF link annotation
    • http://powerpoint4you.ru/spider_man_comics_free_download_in_englishdgtth.pdfIn PDF document text
    • http://vulifux.66ghz.com/darexomovipebew.pdfIn PDF document text
    • http://legendarycraft.ru/get_followers_app_download_for_instagramznag1.pdfIn PDF document text
    • http://mizolaresunade.iblogger.org/cheppave_chirugali_video_songs_free.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/zuxetegu_jolun_zojitijomefeja_kujasa.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/91682913950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazozugafen.epizy.com/cardboard_sheets_hobby_lobby.pdfIn PDF document text
    • http://xaduneraxoden.rf.gd/molevajewefatezepemovufuk.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/naliluk.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/whatsapp_install_free_for_android_mobile.pdfIn PDF document text
    • http://kavobomuvaweg.epizy.com/google_assistant_apk_4._4._4.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/honda_accord_2017_manual.pdfIn PDF document text
    • http://ditajizuru.rf.gd/karcher_k7_85_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/wezexojoteripikoforal.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/corporate_bylaws_template_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/identifying_abstract_nouns_worksheet.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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 5092 bytes
SHA-256: e8337b604af7a183fa53ad336751e1691dd13f9c0a846b389953ec13a7eb11d9
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10636 bytes
SHA-256: 0707f92ccc15fd281406c98fdbaa1839dd7068c28f794ae179d25857d5ae9b59
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 18564 bytes
SHA-256: ed6a1f5d7849bbbefbec7389fc347b88ee90bac57d43a785e6fb21af2aaf4bd7