Malicious PDF — malware analysis report

Static analysis result for SHA-256 234548ade882a964…

MALICIOUS

PDF

77.8 KB Created: 2020-12-19 17:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 240c26b7b358ac120a0ae37cb388979d SHA-1: 73173d86f6a41142c4939e15b8401c5575406266 SHA-256: 234548ade882a964a8893beb96db10c45e9ef2327757fac3a3b5df8b68fd2697
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to a resignation letter, likely intended to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=letter+of+resignation+immediate+effect+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5fc5f0abd722f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457857/normal_5fcc94619e20d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f874b08446af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f94a1c960014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404121/normal_5fcef78f61538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_5fd88cd1928c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5f9a41c2c06e5.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/34a395d7-c399-4aa4-b90b-bb0a0757043b/wowaxusunigikijej.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/pisevenavinasena.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/54453546541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f9e776-d72f-41b9-b5d6-23320585113a/manual_dl4_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8550e4-e71e-4c25-93b8-4f882894f4b9/friday_night_lights_movie_online_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932589ab-a8ed-4552-9ceb-6957bc55a839/pexubiwovarude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef5a9c8-0814-435d-9fa5-25ba91470de4/gafurizatadelamebo.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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5416 bytes
SHA-256: 337126d9ccd0239e32f2b891ce043d80ec801909fca7841d8467d781463e0d79
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 11504 bytes
SHA-256: ec0505593e1b6d83fdcf7465ce548d64d2607e876a359c3721a3bc51b5f75bb6

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