Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3378f761c4fb13d…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 16:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f54bd154669091fe6aa5afeea2617194 SHA-1: 0d8de89d68bedaf3e8923a745d159d8980506ba0 SHA-256: a3378f761c4fb13d0ccdf294a00bfc9050342a2bbd05da3a1e3940bb5c668830
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/wix?keyword=fight+for+my+way+ep+11+recap PDF link annotation
    • http://kupiokno.su/dejuzakidisudinip8hy7c.pdfIn PDF document text
    • http://topcreditreport.info/powerflex_4m_drive_software5nt5t.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/iljahgH/smash_hit_idiom_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/iigeiiy/66944769130.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/Fnih3MA/62230146891.pdfIn PDF document text
    • http://normal-id.com/westworld_soundtrack_rarx56f5.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/giThfhc/86962112734.pdfIn PDF document text
    • http://physcoo.com/lila_abu_lughod_writing_against_cultureew643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_602001f644047.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/yaesu_ft-450d_manual.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/heart_of_darkness_game_deaths.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_604d1df210e92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff1997fcd5c1.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/64372744814.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
    • http://kukejisagev.epizy.com/facebook_video_er_online_free_mp4.pdfIn PDF document text
    • http://tirawuko.rf.gd/android_google_map_api_direction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5d69ba-2160-485b-8d48-500fbbeac427/best_quotes_from_the_forty_rules_of_love.pdfIn PDF document text
    • http://tawosowi.epizy.com/60745084559.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/stihl_024_av_super_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c5e33c-beec-4c2c-b9ec-a1b196ecf2bc/mikudasajigunix.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/46749030157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7ebd97-d75f-4f3b-a235-4106cb406e14/tp-link_av600_nano_powerline_starter_kit_setup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 3484 bytes
SHA-256: ef40a16abb335923a5eb755bb10f80c2d3bca1ce8169d702a2ce55488d45f2f6
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 5104 bytes
SHA-256: 7242bbfe5afbfb0777f21cb4216838d75dc8b949ed76def0e6f4ed4d600ad3e6
font_02_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 10228 bytes
SHA-256: ed1cd8eefd9691e781a7ef186a4830b842eba8710f0fcc37ef63a599b5c761dc
font_03_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c