Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b9a8c7ca25d480…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 11:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02670e0aefa8339a38ff69c39b5d1ae2 SHA-1: f9cee948b4d98a18acce03f65cd41a46792aff4b SHA-256: 86b9a8c7ca25d48063b1ec74e21a2e78513832a8dbee41aab36483d4eea58e40
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=conceptual+physics+transformers+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fd098171909c.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/ihGigWi/cake_baking_classes_utah.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/kB0hDoO/44168560218.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/3jevWaz/world_war_z_gameplay_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/ehfRDEO/condado_puerto_rico_restaurants.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/ifPFf4r/chicago_weather_tomorrow_evening.pdfIn PDF document text
    • http://flylovel.com/tifumibakovasunedanonagch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_5ffe0a0589a4a.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/chdJiee/amazing_spiderman_2_android_gameplay.pdfIn PDF document text
    • http://vanlit.ru/mofamodugovazofagulpwbuy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_6048a49ac5b21.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/HQiuibx/death_worm_free_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kixepijap/ZvcJge6/samsung_internet_browsing_history.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/fhfoSyf/atomic_redster_doubledeck_3._0_gs_race_skis.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/0hfjigE/bmobile_trinidad_vacancies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/how_to_transfer_property_deed_in_pennsylvania.pdfIn PDF document text
    • http://mimelaketikapex.rf.gd/pevizafugivezinakepe.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/waw_leviathan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/neet_exam_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/99043862513.pdfIn PDF document text
    • http://lemujiv.epizy.com/99465835337.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_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 5356 bytes
SHA-256: 17a034eb32d5dd14f59b52f7d6be848663e84e0844b64033e9dead057ad2d7f7
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 11724 bytes
SHA-256: b635ad26233ddd3c52731f365eca8aa3741de374cff3b6df20bc1f81379041b3

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