Malicious PDF — malware analysis report

Static analysis result for SHA-256 062a8ac9d1a24288…

MALICIOUS

PDF

92.4 KB Created: 2020-11-11 09:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2d34e952e25fc0c7020d2357b93b5a45 SHA-1: 45070eb3bf07e34b628677854f1c697dad8eeff0 SHA-256: 062a8ac9d1a24288ce20e5b83bb9e2b26d43e133a6110a2c57a79653d1660e4f
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to contain references to the malicious URL and potentially the application used to generate the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?keyword=g+switch+unblocked+games+66 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_5f99f9ec68326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f95becca60a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f9452429c2ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f91122e658a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/cpm_algebra_1_answers_chapter_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/anne_of_green_gables_play_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11e7bfb-752c-4f6d-b71c-a97b0cf9911b/49100551878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97463d3d-03b7-4533-8d9b-d3cd9fe27bfe/3862303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c6748d-1dd9-4e1e-8469-dd2c46b57ca1/nelemit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8149c7-ed3c-432a-8b05-9414fcc892e5/dusapupik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb26ec99-8a41-4dec-876c-45281d9aa96d/59986854136.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/cpb_study_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aecfdc3-89f8-4ab0-9c2b-ce566059bdea/60099552543.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 5620 bytes
SHA-256: 2892a7c1d927bbee9c75c94e2540c5345c4ce2f1670f9180c4a37ec01f33bae8
font_01_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 11064 bytes
SHA-256: 32b5dc2adfe27dcf0c996bbc3b62d94d115a4acba4e034a965048df1c6101317
font_02_sfnt_off000156b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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