Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c37327006e4d5d…

MALICIOUS

PDF

80.7 KB Created: 2021-04-18 05:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ddd7362af483307738ee7e39fda268f SHA-1: 6db5a2d4e1cf59bacf0738c837176db906ea05b1 SHA-256: 25c37327006e4d5d1dbda749172e46afd0bd578f0bccad2c3f10df1b9014b6ae
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 0.9997

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://gimoguvi.ru/strik?utm_term=what+qualifications+do+you+need+to+be+an+occupational+psychologist PDF link annotation
    • http://dunijekunabov.22web.org/71451649697.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/luzudawivezene.pdfIn PDF document text
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/fofafo.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/3969123.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/5eb4d158cdb1aab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rapaxiwoxopob.rf.gd/guxopanazexiz.pdfIn PDF document text
    • http://piwumutix.epizy.com/asynchronous_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449cbd52-251a-47f6-9e41-3ad3ecce9b1a/55295091160.pdfIn PDF document text
    • http://katiziwaw.rf.gd/28027635406.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_47ff361b45224b55b7a5238653dd539a.pdf?index=trueIn PDF document text
    • http://nanaxaj.rf.gd/98965745738.pdfIn PDF document text
    • http://ligagenaragad.rf.gd/xozabixabode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536e31d6-1325-4ee8-8d98-6d1ae8ee86a4/14000_things_to_be_happy_about_review.pdfIn PDF document text
    • http://rivagajogitow.epizy.com/how_to_change_oil_in_yard_machine_snowblower.pdfIn PDF document text
    • http://zajaduluf.epizy.com/fofetowenowutekige.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_84f4f46ff60c4f1f8735afd7a01ec971.pdf?index=trueIn PDF document text
    • http://vibexezesi.epizy.com/vebusopur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fe4882-5f81-4743-aeed-3a2e2e50ebcc/puvelojeniwowijuwawopukuv.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/assertive_communication_worksheet_therapist_aid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4104eb-11dc-48fc-a86d-9c378749692d/xalonanejejidudaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae43b8b-c293-43b7-953a-ba923637a92c/how_to_apply_for_medicaid_for_nursing_home_care.pdfIn PDF document text
    • http://fasosurid.epizy.com/figojaviwokasosituzag.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_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 5704 bytes
SHA-256: 5d721db3247cb49d9a3a910788fd6fd93c0df85b799f01de7136347f7d392763
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 11136 bytes
SHA-256: 9e68d98aee66e939fd5834e14d93d376d71e22a768a0e3e8cac053b9515f6ae3

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