Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c272e9c81d1502a…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 15:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 45ff337b9fe643fe935ca192cb3f7a7f SHA-1: 95819e6fe183fc380a59761f989f4443e55d202d SHA-256: 4c272e9c81d1502abb93e7c91251690d7ea1deb528f9b22b925a6d08b32c4b83
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

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://resalured.ru/award?keyword=dips+academy+linear+algebra+notes+pdf PDF link annotation
    • http://jekeluxuto.mywebcommunity.org/takibelasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5ff5189767c35.pdfIn PDF document text
    • http://timinipitos.22web.org/saga_cazadora_de_hadas_1.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/mosukolisibekobo.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/academic_writing_skills_3_teacher_s_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_60499658c8ee2.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/nifetufuwenot.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/navegunaf-tigisemojawut-warimekoxe-bapexumavog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60527a4e3b2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_6035e71f37a8f.pdfIn PDF document text
    • https://wotawodakel.weebly.com/uploads/1/3/5/3/135316359/demutesunen.pdfIn PDF document text
    • http://wonamesavap.iblogger.org/did_not_do_justice_meaning.pdfIn PDF document text
    • http://wakekuluma.iblogger.org/what_is_the_most_watched_news_program_on_tv.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/doritomorada.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/dMFMidI/flower_coloring_book_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/wewisadavoj/nhirjdE/gabokedevopidopuwag.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://s3.amazonaws.com/bidivo/2_player_chess_app.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/wunom.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/ladejotenagifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/65658109046.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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 5504 bytes
SHA-256: 1f5435613f1d4ec6c328f85daca5ae7f19b682af33e6545d0992537d43c7647b
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10648 bytes
SHA-256: 58ea8dead66aab8e0f06befc408e4ab00c68c8b8445c883466c1aaef6bb2927d
font_02_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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