Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd0cca3edb02dc4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-11 12:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8926c60f3a4254303b7f1dbbd06de8ea SHA-1: 12f98b339ed4878e281a8078fcae99469c2f4696 SHA-256: 3fd0cca3edb02dc48cea0f1d07e12166e08525db3f95c21ec1ff2548acd0fec1
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 0.9993

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://leonvi.ru/award?keyword=articles+in+english+rules+pdf PDF link annotation
    • http://jisutuxoxaza.medianewsonline.com/mr_coffee_caf_barista_parts_milk_reservoir.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/how_to_write_a_professional_resume_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/STkgfjf/14417892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_60351de6c804d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_60462e7dbfacb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_60127ec50ec98.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/38622559123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_6039527378552.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/xlkhcv4/pacific_fire_and_security_systems.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/QJvOibM/alto_s_adventure_pc_online.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/87385733256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5fe4a28bee092.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/barcode_country_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5bfbd8-d944-42f4-9df5-60f09bf5f49e/what_are_the_12_steps_of_aa_na.pdfIn PDF document text
    • http://vomifavub.epizy.com/my_not_so_perfect_life_summary.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/red_a_crayons_story_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f56669e-a1a7-45f9-ada5-6c46c486156d/lofexonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e384b1b-b1ce-43de-a18b-ac473b3e8a6e/experience_and_education_john_dewey_free.pdfIn PDF document text
    • http://jopugobov.rf.gd/how_many_pages_in_catching_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169f91dc-fec5-483d-9682-86c000bf13bc/53428169151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450a6485-9219-4bfd-8c6f-ca694355cb86/how_do_i_set_the_time_on_my_citizen_eco_drive_promaster.pdfIn PDF document text
    • http://koxowideza.epizy.com/sadesovezonipisop.pdfIn PDF document text
    • http://disidigepaxu.rf.gd/berichtsheft_ausbildung_vorlage.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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 5196 bytes
SHA-256: b7ddefb71c0cd41b494922930dbb538faca3ec9be564fbe704989cadd5dd1d89
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 10468 bytes
SHA-256: ca00a6b7d54a2278268467a69f983e7f81b0bb2031e739c8bf9068a6e6b523b0

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