Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7d4eb01742470a…

MALICIOUS

PDF

73.7 KB Created: 2021-03-03 05:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d261e11cdf3bd6743e376da73885e40 SHA-1: 523db674479bd18f9101418f257e89333f20efeb SHA-256: 9a7d4eb01742470ac167f305193845233434a846f46c33d00ab2a911a4fe80ac
126 Risk Score

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-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/strik?utm_term=mythology+edith+hamilton+75th+anniversary+ebook+free+download PDF link annotation
    • http://sodowetan.mywebcommunity.org/does_eleanor_die_in_the_haunting_of_hill_house_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd1c3544c01f.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/ao_smith_water_heater_reset_button_tripping.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_603ee8d8973fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408583/normal_5ff71b11b36dd.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/77741573545.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/jedonal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464067/normal_5ff4632b9018b.pdfIn PDF document text
    • http://vugadabupujexax.22web.org/steps_to_personal_revival_book.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/c_for_everyone_2nd_edition_solutions_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_600dfe754999f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5ff1e781e9f91.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://kubowulurarekij.myartsonline.com/how_much_cream_and_sugar_in_dunkin_donuts_iced_coffee.pdfIn PDF document text
    • http://watenumedar.rf.gd/42931300879.pdfIn PDF document text
    • http://fenigubigona.epizy.com/flachau_austria_snow_report.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 5776 bytes
SHA-256: d0aa6609cd8d7939d0ece0318ea5dd70276a2d9044c4275c345acb919b25edcf
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 10932 bytes
SHA-256: 8f7827b8d26496eb34115d80aa3bc28ee85e9013044d344e571e7b7c4458b3c8
font_02_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378