Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8d91e29b82bbed…

MALICIOUS

PDF

76.4 KB Created: 2021-06-09 02:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b0072613bc18a0dd36d16de1d873d3f4 SHA-1: 3d5f40a14320d60f40fa20e3c741b35933304149 SHA-256: ac8d91e29b82bbedfda5cf0194c81785518146485e3331594568bbc1f30628b7
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The embedded URL and the document body content, despite being heavily obfuscated, suggest a lure for downloading content. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the malicious intent of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=hate+story+4+movie+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414502/normal_60552a376fcdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_6039a3cc92baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_60100fd2c16f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_6064dc2e1559b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_60198072ab960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5ffa2af64bbde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_5fec7f1899038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60461c9309603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_600de9355523d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_605fa3869fdcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_606b09d57f863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_600951db67237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_600c09c55675a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_601a4f7e92359.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/38655182-bf74-40fe-b984-9657df75a48d/gospel_of_judas.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144774633/bachelor_thesis_themen_informatik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85e8c12-49d5-44fd-8061-f60078d49d7b/74286613394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac766942-4f89-4dad-907f-97d65936295d/general_physics_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d1a722-6d52-45a5-914a-5b66fe7ea2ca/poduzizokezukusepum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd01829-5c3a-4aa0-b7e9-4d6ac730bb58/lovutewawawate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bece209-b696-44ad-954a-80824e63bbc1/what_are_the_witches_in_macbeth.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422745/what_to_do_if_your_sharp_tv_wont_turn_on.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_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5356 bytes
SHA-256: f7a02c240f2deff10142da5c338a1bc7fa39beecdfc2bba16d736c28ca33533d
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10660 bytes
SHA-256: d7e6326cedd4f2e5b5a4a8b712611ebc76588579900e9236ef858df61b459710

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