Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9ae0e76a5fe951…

MALICIOUS

PDF

80.3 KB Created: 2020-11-21 11:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e20cadc68d5225357eabd5a44b3b4df3 SHA-1: 11bab2ef3865d3e683fe5b49b14031f8c8d59d79 SHA-256: 5c9ae0e76a5fe9517adc5faec47d4c987d06c933a862646196fbbe8efbc18383
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-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://traffset.ru/aws?utm_term=performance+appraisal+summary+report PDF link annotation
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/6577349.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/voxexini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8cbaff9b7ca.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/gufovuxalezoxa-dokavipem-rufibaposisaji-wujubudadewuzur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f88a159a07db.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/zeretokexomaxepimop.pdfIn PDF document text
    • https://vagomonezupu.weebly.com/uploads/1/3/4/4/134403629/rutepugera.pdfIn PDF document text
    • https://figerifefiter.weebly.com/uploads/1/3/4/3/134343277/7816533.pdfIn PDF document text
    • https://suvosimi.weebly.com/uploads/1/3/4/6/134688706/6902edb10.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/jitimesolagun/kejizeka.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/secretary_of_state_gates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d84731-5dbe-4d92-bed1-245b90cb251d/sijonitisato.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/81563337623.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/seed_plant_in_soil.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/kiwug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c879ebe-8d20-47a2-a83e-acdf8d7f75cf/quantum_machine_learning.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_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 5264 bytes
SHA-256: 6495dc87f63b28a6bd3bb203618f6faaa7266c05e811a208011da41781dfdac8
font_01_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 10756 bytes
SHA-256: 767092c3ab422b1360c894e24ae7c45ccc74579c9bf60bb4441d0cc2063bbc04

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