Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b644c6308aa8eb…

MALICIOUS

PDF

90.1 KB Created: 2021-01-01 09:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 850888a571bfb76adb96b99dbbb23d48 SHA-1: 157b944dff206071075a135a4422d8071826acad SHA-256: 42b644c6308aa8eb5e31c609ad245249d65e66f946375404dc8c0cddff05c39d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF as malicious with a high score. The embedded URL likely leads to a phishing page or a download of a second-stage payload. No scripts were extracted, but the PDF structure and heuristics strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/strik?utm_term=cut+it+brain+teaser+puzzles+for+adults In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5faaf03354823.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/jokajopiret-gavuxo-toxegedudugumi.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/jgdhegi/complete_biology_for_igcse_ron_pickering.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fcbedc3218f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f97964d98064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5fdd07a7aace2.pdfIn PDF document text
    • https://midepixa.weebly.com/uploads/1/3/4/6/134622545/f977a09264.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/xezonijida/password_for_s4._bit._ir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3204d9-800b-4c8c-9f52-b3df9ed85ec2/71788385600.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 5132 bytes
SHA-256: a690e98a06a8be8a528d46e0c4b3776301e251521a91b1924e53b10101270bd4
font_01_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 3332 bytes
SHA-256: 8889d4f8c26cb65b352ee09590e587d3dcb24bd33fa58cb7d8be76a75d8dab9e
font_03_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 11352 bytes
SHA-256: c6367fbd5ff4b927e6a079b5d7425b22748393f1a582a667bca2c79487131a90

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