Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb35a9141e2a55c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-10 23:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4ebe358969e3364f3b0a7139f9c248a SHA-1: 13b167c898fc4949816a14b994f25cf1aaa7d1a0 SHA-256: 3fb35a9141e2a55c57b9040f5f286cc009941d7c92e607f3855a2058e9511da5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/award?keyword=paola+bergallo+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5fdfd78497ec1.pdfIn PDF document text
    • https://wikejawuwe.weebly.com/uploads/1/3/1/4/131437941/garemis_jasena_puxewiw_ruvufipi.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ihpbDih/31902372484.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/komametad-befusiwom-gizuz-todokuzuroga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367656/normal_60051615e3197.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/iajjhcF/train_simulator_controller_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fc942a11818c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421208/normal_5ff9b9ec564be.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/duvimebisuv.pdfIn PDF document text
    • http://bofesota.66ghz.com/how_does_a_hand_crank_sewing_machine_work.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474170/normal_6006e85f6d5b6.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/lijulijowivaze/osmosis_amoeba_sisters_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/4386636295.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/74784155219.pdfIn PDF document text
    • http://taputideletu.rf.gd/whats_the_best_trade_to_get_into_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/17396858549.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_215cf675d6ca41538250ccd0bca524c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojaxub/lugalomizamoforufal.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_f5bb1cc24d194eb4a02fb6fe56a51009.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_a66eea55a49c462a9906a7a472b7ee6a.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 5172 bytes
SHA-256: 2cca993e0d32de79736968fd27a09e6c6fc5f5f0aa1fca8312f13004dc489350
font_01_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 11180 bytes
SHA-256: 357463625f29ffee712e211cc7fa5a656de5843889a59db9e386f9c663d5ff6c

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