Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4026c9fa315c3bb…

MALICIOUS

PDF

72.8 KB Created: 2021-04-01 15:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e6a3558dc1bac26663bab00fbecff52c SHA-1: d9d4dfb35f887508988c733ba1bcb89877f6e732 SHA-256: b4026c9fa315c3bbbe1b81ae49cdd54c724c18da52fa8b78621abffa1faf427d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with link farming and potentially phishing content. The PDF structure and embedded links suggest an attempt to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/award?keyword=biomagnetismo+mascotas+pdf PDF link annotation
    • http://fbcopyright-center.com/460116673341hfpu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5fc604e97a9fd.pdfIn PDF document text
    • http://migriruy.ru/womirogonafer89r8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6046e0e13e170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_6052a67073318.pdfIn PDF document text
    • http://vkysnaya-eda.site/88814366219nu424.pdfIn PDF document text
    • http://digitalmedialit.com/gta_vice_city_cheat_button_apkpurechhlx.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/UgehHzi/ottoman_wars_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/hihcSyt/mad_planets_fun_challenging_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/jiejdoX/residual_value_car_lease.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/jgf7eLw/wulinokabaju.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_601670fe7b099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5453a6ae-7247-4c21-8f3f-f77b683ef564/jusiguzigaxirosurunipiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b9b1b8-8b89-4b88-9b97-8dd4c0dc945d/ferrari_812_superfast_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00a7029-5250-415c-81ae-3771c7099b97/73136526216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42466628-ed50-4b0a-bf51-898c1b5d94e6/primeros_auxilios_para_nios_diapositivas.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/lepifik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee433b0-bd7e-41d9-98a0-de26a1426f65/how_does_the_big_easy_turkey_fryer_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12b1cbb-ece7-4b65-89fc-6fdcbfc943ad/gasijoxudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25569f6-360b-44a5-9229-6292a03300b8/zixazatajedikuwezu.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/gatusifazebufajetawalo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 5184 bytes
SHA-256: db5de34aa55f24cba0991e71947d1a02136b4bca2d2029ae6a3c3113e38316e9
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 11272 bytes
SHA-256: f5e3959ef3a2d7b85f92512b46fcf212d38c025c3215938e1bb5739b94627d20
font_02_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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