Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4f9d78f7c69810…

MALICIOUS

PDF

78.0 KB Created: 2020-12-17 07:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: df27e91cb34100689bf0d6e1fce23042 SHA-1: 84ea4efd607a57d4b69156533328bc20d321baa9 SHA-256: 8a4f9d78f7c6981038dd73df61d16d5041e32502e66e92d5a5bfedcdb92d919e
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 URI pointing to a suspicious domain, which is likely intended to trick the user into visiting a malicious site. The document body, though heavily obfuscated, contains text related to 'reading glasses prescription', reinforcing the phishing lure.

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=half+frame+reading+glasses+prescription PDF link annotation
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/biguno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fbd61795ee52.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/povutobal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fc080c51959e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc28eaf9698b02c7f2b2aca/t/5fc4278ae6d49a06bb1589c7/1606690698569/11118298107.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nccn_guidelines_thyroid_cancer_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/73048439528.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/rh_isoimmunisation_rcog_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b53fc6229360ecb2a747/t/5fd11a3530e9c03d9822fe8e/1607539254799/gun_master_3d_mod_apk_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/4025960923.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68f7488c99b6d37ce80fd/t/5fcd5da105ddc9599d330d76/1607294369841/spaceflight_simulator_download_mod_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfec5a97599144ebdd192/1606287046389/access_to_health_14th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/netafigerilukug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d45c6609fd0ee7aaa180/t/5fcdb086fe657040d5afa6f4/1607315591075/nuwesemexodafufejiraxur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b332fa-f68a-4078-971e-3e533d33eefc/42902153954.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 5224 bytes
SHA-256: 31ae2634f19f62f959510b7eb6c1d548d01627ba18548b37e01828f704c83186
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 11004 bytes
SHA-256: 9b6deab2b8e55e8fe5ab565d0d2c5186b22ac53ea5696904ee4769d5302a1174
font_02_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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