Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f26b799b6196eb…

MALICIOUS

PDF

68.3 KB Created: 2021-01-06 07:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6559582a372c47114e3c73a261616f46 SHA-1: 7283b6d9801d581694ba22ce8c0bd8fe855116c3 SHA-256: e3f26b799b6196eba69867c1fac56575071bd62325f92892e2a1796b6f06dc8f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/aws?utm_term=bariatric+surgery+australian+guidelines'. This indicates the document's primary purpose is to lure users to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

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
  • 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://ggtraff.ru/aws?utm_term=bariatric+surgery+australian+guidelines In PDF document text
    • https://cdn.sqhk.co/lojosewude/Zejggfk/lumoxagotirufizuvapagufa.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/cnrphjs/22048927307.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/iaEiijc/31099548903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fe7262126819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fdff79d47054.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/6a10504d-5b53-4b53-a13a-67b82c26c1f3/20737437570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d16a153-08fb-4277-8091-1c9d27078a45/gavabebazokeriwufekuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde3dc2d-c1e6-4ce3-ae21-ce6ad4d6d58f/jolakipikanusugivuvopute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcc9096-2431-477a-815d-8932b5e6aa3c/77419396789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b5be22-f056-46f5-89c5-e1f8df5ee7b7/64952889722.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/aprilaire_800_humidifier_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ffc434-8005-4230-a877-6ed4f2cc47df/immigration_political_cartoon.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/canciones_y_acordes_de_guitarra_gratis.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_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 5260 bytes
SHA-256: 0d8b85ca71d38fd9589e190dbf4329fbef71c630b0978f79795e59c16b274eb6
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10172 bytes
SHA-256: 5d9b982b31a620818ab098e997f59bfff1f0d053e3c020666cc2df11c6182093

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