Malicious PDF — malware analysis report

Static analysis result for SHA-256 784643aa582b2d90…

MALICIOUS

PDF

76.7 KB Created: 2021-01-12 07:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d7bd66a5d15fc55188cda59774facb9 SHA-1: d8c663f4e05a8db549c2e3fab88fcb536b40b611 SHA-256: 784643aa582b2d900b480186e8459dfa314febe4a6e17583e71346526af855bd
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, consistent with spearphishing.

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
  • 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://trafftec.ru/123?utm_term=zoids+saga+ds+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5f8b809dc7c39.pdfIn PDF document text
    • https://site-1178235.mozfiles.com/files/1178235/onkyo_hf_player_unlocker_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_5fad63ff92374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5fa89d1846761.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/EggmhgW/tic_tac_toe_strategy_pick_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_5fd7805a12189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd2e13e4d931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fcaca39b876a.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/jcjcLmI/20194576315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443362/normal_5fba6fb0a7646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_5fb5ccdf0c812.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/oUgjhh1/your_phone_companion_link_to_windows_apple.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/temujonuwu/journal_of_american_geriatrics_society_author_guidelines.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_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 9176 bytes
SHA-256: 043e8b0dc2f806b949c270aae74ddb8b0cf3daf96dab0e51e3cd160f15e90990
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 4948 bytes
SHA-256: 06095f744d1cae649a4127614abbc986d6723e4706924d064c6e8c6af3ef8775
font_02_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10444 bytes
SHA-256: cfbb5964ed2a4db866c9d9bd5d8098ad0819921e900d9605681af70499867195

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