Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f605daef98ad8…

MALICIOUS

PDF

73.3 KB Created: 2021-03-06 16:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2cd40f2fd646f4c7c84299ac7d2dd29e SHA-1: 9376ff43ad08863e4c6f79d744b777384598f54d SHA-256: 8a6f605daef98ad800076705e7a758d05b51865c307f6b3575aac7c6666a7ba2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to a 'fish anatomy coloring worksheet answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=fish+anatomy+coloring+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489598/normal_603a6d2540283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382620/normal_5fc6574190550.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/winumigutam/19460521763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee94025-65f6-4673-b5c3-cc3c0c689d88/58633206208.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/asos_size_guide_aus.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/93283576766.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/54235415749.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/85662017331.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/47090305530.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/roadways_bus_conductor_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/samrat_asoka_tamil_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/downy_fabric_softener_dryer_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/carnivores_2_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/ninuwakativunasoravam.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/66066456911.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/free_lagu_beyonce_broken_hearted_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3ef243-8f62-4cd0-adf4-cfc81c8874dc/zijinavufisefimelimubig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c9aa89-e1b0-49ec-8ce8-6c10560cc52c/91966815023.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/govos.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/79703573994.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/77265491170.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 5424 bytes
SHA-256: 0328ccbaef6e066312b923e62e931e9c5ebdecfa66a8fd30d8f80ece895f8296
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10168 bytes
SHA-256: 1a107cc88333eef0277260bd7cd6ae0f5b33d0d4b5b949db722b2b225922f2d0

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