Malicious PDF — malware analysis report

Static analysis result for SHA-256 402f8a59645e6577…

MALICIOUS

PDF

68.0 KB Created: 2021-02-28 05:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d52b3f89919f4373f1aea14d0bbfcc68 SHA-1: ad499cab632d1b6dade9d5bd554021b7a33f6957 SHA-256: 402f8a59645e657768c3aa5d9ef7d1a2c46f37bd1a079e6e3c52e6a9ede918c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=osha+standard+for+storage+of+flammable+liquids PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600ef4dace84d.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/cjjDjhQ/high_speed_wifi_file_transfer.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/aq0jjgj/tuzasazevusikewalitejil.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/jjjbEmQ/flexible_flyer_breckenridge_swing_set_instructions.pdfIn PDF document text
    • https://ziloboze.weebly.com/uploads/1/3/2/6/132683463/kujakiwurevij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fccd5fd1f3e1.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/47Pjbhe/59960047545.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/hOS6vry/toca_life_stable_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fdfa6031bc4d.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/jkjfjgb/lixomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6029e76433376.pdfIn PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/8960829.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/hjfbHz0/menix.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/bejulisok.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/Qibgjia/6523446385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 5612 bytes
SHA-256: 91568039c49c4738192b3c0153b09a125e0e26907c72bb40209cd8c7fd4cc6c4
font_01_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 10748 bytes
SHA-256: 78fdf6cde8bf4e95ccd9d34df8f7994fe537f46fe295caff4a00b252c9e09a6b

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