Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfe8feba8895ff6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-13 21:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b8c2a3bd0b6b1d0bbd75f4c34b16aa17 SHA-1: 391231c9b8aa5485fcba57546efe9fcde7fa7088 SHA-256: 7bfe8feba8895ff6aa7caffd48564196e6b9f1d68064a801de8c68404f0b529f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=what+are+recognition+proteins+made+of PDF link annotation
    • http://solent.bar/735725903490fusa.pdfIn PDF document text
    • http://rajonilelubej.22web.org/the_complete_ethical_hacking_course_beginner_to_advanced_free_in_hindi.pdfIn PDF document text
    • http://rotugozebowovu.iblogger.org/national_antibiotic_guideline_2014.pdfIn PDF document text
    • http://biggymstoe.com/aaron_clarey_bachelor_pad_economics9v6lh.pdfIn PDF document text
    • http://fexabudobix.getenjoyment.net/audiometria_verbal.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/what_is_shinra_tenseiieza4.pdfIn PDF document text
    • http://dithetsen.xyz/streets_of_rage_2_soundtrack_reviewttnfn.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/83065719366.pdfIn PDF document text
    • http://kevilokosolug.iblogger.org/advanced_english_speaking_course_free.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/bibliotecas_virtuales_en_salud.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/jotogorurekuro/dogepugiterotupuvut.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/kiraxeb.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/ragakuwox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d609eed-00ad-4a74-a2c2-eb06cc20eae8/volew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cff6b2e-a69f-4e49-80ab-348d82605c65/which_language_need_to_develop_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88ed91c-2516-4da5-8a47-9a63b93cee16/5716702839.pdfIn PDF document text
    • http://mubadel.epizy.com/foganakeleduf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630b9e42-f099-4663-85e2-e576c95724f9/benezisabitijedobebaduxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eadb70-50d6-4895-98c6-c4130c216b1b/37529054806.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_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 5552 bytes
SHA-256: a7bcdbbb5d7a88d0a5fd55af7d706ca4b9c26b44b00646ab1c08c1c329bb1fd0
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 10584 bytes
SHA-256: 11b06edaebbe21cb9e496e85d0b0c6411f48940187467b3271178c24cfb7adf6

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