Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b1dec84663bbc6…

MALICIOUS

PDF

74.6 KB Created: 2021-03-16 16:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c5364734cfaf8c9763890f3a79839538 SHA-1: 9ac7c1f126078c9acdc5d4ca1d0b8d3c62b4cc04 SHA-256: c4b1dec84663bbc6f32603337190f6cd882dc73be65eea9c11655920ef8ca826
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=parallel+lines+cut+by+a+transversal+vocabulary+worksheet+pdf PDF link annotation
    • http://exampl1214.com/93218486729x5n88.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/anatomia_del_pancreas_endocrino.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/oROrXxZ/university_of_alabama_football_news_bleacher_report.pdfIn PDF document text
    • http://alesyasemiletova.com/international_s1700_dump_truck_specsbkpgm.pdfIn PDF document text
    • http://vovodofozufora.iblogger.org/56855232836.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/hihJUie/71603054185.pdfIn PDF document text
    • http://lowixop.22web.org/pabiven.pdfIn PDF document text
    • http://bonus332.site/tidiweradanetevilch82a.pdfIn PDF document text
    • http://dostafood.xyz/advaita_vedanta_teachers_usav5382.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/kosowapa.pdfIn PDF document text
    • http://bobiruropiles.22web.org/finding_slope_equation_worksheet.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/tableau_certification_in_bangalore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegepifewomu.epizy.com/the_original_torah.pdfIn PDF document text
    • http://niginikixino.epizy.com/86733512846.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/the_skin_im_in_chapter_26_summary.pdfIn PDF document text
    • http://tekufokejogarik.rf.gd/getting_started_with_spring_framework_4th_edition_free_download.pdfIn PDF document text
    • http://mozogovasopuj.epizy.com/calculus_3_tutorial.pdfIn PDF document text
    • http://tunawibiga.rf.gd/o_liberalismo_poltico_john_rawls.pdfIn PDF document text
    • http://wutumaxade.epizy.com/dd_cleric_spells_wikidot.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/lezeni.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5704 bytes
SHA-256: 8389f1cf846fc043bd43aef9e07d515289767c6c4a07f9a6ae133999e6cad3fc
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 11092 bytes
SHA-256: 98e93807b84cf7894f1a284dcf4618cccc6698105ed030eec4ae8738314502ba

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