Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5454efba1fc74f…

MALICIOUS

PDF

70.2 KB Created: 2021-03-27 23:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 483c963fca26c905c68239352fb2d57c SHA-1: b25c1738e7572e17ef5817e02ea64cf7eca71276 SHA-256: da5454efba1fc74ff1980fd636b887ac8bc26ac94cbfa9ab28c9e7aaeec8f7b0
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/123?utm_term=tecnologias+de+la+informacion+y+comunicacion+espe PDF link annotation
    • http://butalinonoruma.scienceontheweb.net/wexijas.pdfIn PDF document text
    • http://creditscoreusa.info/the_spiritual_man_sermon7jk22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454424/normal_5ff633210ccfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fd5f328eeb1b.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/salati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5fc6b09ef34fd.pdfIn PDF document text
    • http://circus.market/raxamibalusazeruxufunukcgtay.pdfIn PDF document text
    • http://uscovidcharts.com/57078858987aatxl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_5fd78878ac21c.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/how_do_i_turn_on_my_i_pilot_link_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_6051ab07a5ce8.pdfIn PDF document text
    • http://inmyshtangen.xyz/how_to_prepare_for_a_dental_implantyak0y.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/8692709523.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/electrical_interview_questions_and_answers_download.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/saravewajepuradaxig.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/95413615866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_d28c3d211b4a42da88c8dc0fb1039994.pdf?index=trueIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_7a2bbc69d58b4028958f4f5ba7491c8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc322f8f-70d1-4157-af59-8337ed29ba50/precalculus_textbook_mcgraw_hill_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58042674-5858-4e5a-8195-7f0539f67ad2/tujopesora.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_2aa90ef0aa824f118eae3287b71c21da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd302514-addb-40c9-9404-9d6ad9f41110/42449669421.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_b5dd53476ca247c0a63720a4f7a95a46.pdf?index=trueIn 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 5524 bytes
SHA-256: e4a80da7cd47ab554783667652632efa9e462ea2a40f82b25c2b566bf6b2f359
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 11596 bytes
SHA-256: 9f38aa075c7afed1c7b6c7f8c502cd4a021d5b028b5f71bf0add6252ab8aa176

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