Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ce56e2f959ccb…

MALICIOUS

PDF

83.1 KB Created: 2020-11-29 18:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82bae0e2a40d3cd73dcafca1b113fe00 SHA-1: 3d0aa4a8ec0ded1ea5f28a5ddc298b710e7b7fe8 SHA-256: ef5ce56e2f959ccb8c2bb554992859297e122b1d0024a56d70713653cde36ff1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, suggests a lure related to 'communication competence meaning'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=communication+competence+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fc08d4110172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fa9e2c8c3a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f89d6fab5cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8e46d1efdf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5fa50f8fe7c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fbbeff809c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5fbdce1b1a4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f9f962a878a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5f96b8fbb78bd.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/76278760-8cc7-42db-a2a7-2f45390973ad/hot_foil_stamping_machines_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/62202565863.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/10230185933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75684238-42f7-4380-980c-551459689d9a/fugutudesi.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/alphabet_template_for_applique_free.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/ucsd_ece_109.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/highschool_of_the_dead_episode_6_download.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_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 4852 bytes
SHA-256: 806f438aa29380dbfd6e66a6833f28df75ff744f46c792535ffaf2410cdce4e7
font_01_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 11060 bytes
SHA-256: 26a7edc4256ce227c17f924850a26aa25f5bc6f341ef3b383601c9dae53c6adc

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