Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ec1d284bca9197…

MALICIOUS

PDF

78.9 KB Created: 2021-03-23 05:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24aaf9e4fa95d673872e6446cab1844e SHA-1: 94bd664a19692f7c4674ebf44c7cc2e4a08a1f49 SHA-256: e3ec1d284bca9197e13dae9cf348f2667182c893d38c56255a0b519d039435a1
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://kuzutuzo.ru/award?keyword=welcome+address+association+inaugural+function+pdf PDF link annotation
    • https://manovofaripoluf.weebly.com/uploads/1/3/1/4/131453531/f038ebb83.pdfIn PDF document text
    • http://nexefugo.iblogger.org/contribution_margin_report_example.pdfIn PDF document text
    • http://serdyukov.pro/81071685736n7i3h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_60543f3e64b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6037f5eccfc84.pdfIn PDF document text
    • http://ruszaimclub.ru/what_are_the_functions_of_school_supervisionowo92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6022c6be8d8e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5ffb305dc5cf8.pdfIn PDF document text
    • https://jawemojope.weebly.com/uploads/1/3/4/3/134399256/282682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ffe172c4999e.pdfIn PDF document text
    • http://cucoupon.info/much_ado_about_nothing_text_analysise7bqu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_60547b422e668.pdfIn PDF document text
    • http://obzorov.site/cisco_ccna_securityr85lt.pdfIn PDF document text
    • http://damvglaz2.xyz/sikubarisibul75xrl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesuzidadubitik.rf.gd/ejemplo_de_comunicacion_masiva_en_la_vida_cotidiana.pdfIn PDF document text
    • http://wogekipa.rf.gd/sonabuzabadakejase.pdfIn PDF document text
    • http://tidefos.epizy.com/dodge_caliber_2020_workshop_manual.pdfIn PDF document text
    • http://zisepuz.rf.gd/xopodejuwulipuzolug.pdfIn PDF document text
    • http://fekerudosepu.rf.gd/who_plays_lady_diana_in_season_4_of_the_crown.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 5488 bytes
SHA-256: 9bb85fd39d5685d7df2456272bd4e47d1ba6fee8402584178e7b08c7641044da
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10576 bytes
SHA-256: bf3506801299fc3418cb16c804d2dcc10038fa62f1f2216fb2d6c68917c6a264