Malicious PDF — malware analysis report

Static analysis result for SHA-256 5988e9818623e01f…

MALICIOUS

PDF

87.5 KB Created: 2021-01-05 23:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: de187afd620093b1fa785d5d419b0e72 SHA-1: 9d2b87643ea3872d0a0d23af735ff2247ae45c92 SHA-256: 5988e9818623e01f11151a6d459ea20e553d34f397629bc7b425151547d73049
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for a redirector link to known malicious infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URL points to a redirector, suggesting an attempt to lure the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=master+theorem+algorithms In PDF document text
    • https://cdn.sqhk.co/wavefekus/jdDJt3m/rolling_stones_logo_face_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/QOhfjeN/38441212752.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/7vgfRu1/wedirasekoz.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/450718de-0e7a-4f3d-92ed-77ee59b1f550/felidajejizijatanevat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061f8a64-6efa-4d4b-8c9b-5cdcbd235bc6/ximukekebawisepinivuvuvuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adaec908-3b3c-4fec-80a3-f498a0e63fc6/ninupakubol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba46ab7-0a96-4e6b-80f8-fed065623a67/fadobowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068f55f6-c93d-4359-9152-a6284398939b/dwight_yoakam_wife_age_emily_joyce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc072428-e17f-475f-b7ff-f17481adabea/pikoxafonexodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbaa317-cf0b-4807-a103-55261e0759b7/kojege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56c2ddd-d59f-4a6b-85c1-c0e2f394c902/nuxuposinubaluvawame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f723aecf-ac26-4fed-9b14-faef96c1f48c/fesigexozeribulibanufut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42be3123-e234-4fa0-94a9-e7861cd7f2a2/newekibati.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/lobajuxetikulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d65d495-aa0b-4227-8e26-c1d2525fbb07/lomifadisenokerezunufeli.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 5104 bytes
SHA-256: ae1d669c018677507d7bc457cfb1d7824baabadbfd3a414a10208ea851cd2ee3
font_01_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 12472 bytes
SHA-256: 4bd941ceaaf8d4d141d534fe012f464b2ee070b70122066352ddea3ef988a5eb
font_02_sfnt_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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