Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad671b2d4659f8f…

MALICIOUS

PDF

72.9 KB Created: 2021-02-26 07:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c0f01a059cafe14cc5a978995a355a31 SHA-1: 1c5613a080a399accc2157389de6ac95eb8e4a6f SHA-256: 3ad671b2d4659f8f3223e5565a7b0e77702eba8fb0aca542b461b7292b084ba8
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://seumenha.ru/wix?keyword=d%2526d+trade+goods+list', is particularly suspicious and likely serves as a lure or distribution point.

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://seumenha.ru/wix?keyword=d%2526d+trade+goods+list PDF link annotation
    • http://copyrightsafetyhelps.com/wexufexvgnqd.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/super_mario_sunshine_walkthrough_part_2.pdfIn PDF document text
    • http://topstop.site/software_para_el_monitoreo_de_redk76ad.pdfIn PDF document text
    • http://triple-doska1.club/beyblade_metal_fury_all_episodes_freefk3ec.pdfIn PDF document text
    • http://1xbet-registrat.site/what_should_a_13_month_old_be_eatingsx5ou.pdfIn PDF document text
    • http://nuveclovet.xyz/the_divine_mercy_chaplet_audiog6xe6.pdfIn PDF document text
    • http://lienforkid.com/5129643100119oe3.pdfIn PDF document text
    • http://fukikenikiru.22web.org/how_to_start_in_network_security.pdfIn PDF document text
    • http://stopro.store/android_emulator_for_pc_android_7lo9kx.pdfIn PDF document text
    • http://copyrightsupport-ig.com/what_is_caps_for_sale_aboutps96o.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/tamosibebefuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepuwuzuvam.epizy.com/87193101135.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/62161193964.pdfIn PDF document text
    • http://fapibudu.epizy.com/codecombat_game_development_3_answers.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 4156 bytes
SHA-256: 7b9a78bc71d00e4bcff8473d51fc82c270a18144a13d22e5cfd906eda86eaada
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 10992 bytes
SHA-256: e6cb01fb40fcd295514656275cbc746ef6d6fadc3a94b03399b80643b213be65