Malicious PDF — malware analysis report

Static analysis result for SHA-256 88553c5dfdd6310c…

MALICIOUS

PDF

77.2 KB Created: 2020-12-21 13:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 641ea5d23da32604b46121361453af5a SHA-1: 196df51e2f47ac3ce59d56bb73e0a75392a0834e SHA-256: 88553c5dfdd6310c989698c8acae16279e6bfb30f2732c567c35b69cc42b6827
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://traffking.ru/strik?utm_term=bad+north+jotunn+edition+switch' is the primary indicator of this malicious activity. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing or malware distribution 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://traffking.ru/strik?utm_term=bad+north+jotunn+edition+switch In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f874edb3b13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5fa39cc734e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fbb08d84bb8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5fbf8788cae05.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/4471c814-e4b8-4431-8292-9bf1abfe0c75/49294353992.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/medical_procedure_consent_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/browser_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d2682e-4f2c-41d0-b9be-b723460a6b25/96838975600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e497f21-bb9d-41a1-8c23-8ee567956c47/honeywell_vista_40_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006c8d9d-5676-4be2-9bd4-683a50e51e4b/38732646893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7f774b-34fd-4753-844a-5cdcc33a0998/ems_field_guide_bls_version_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/firefox_offline_64_bit_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/lacoste_men_s_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facfbcc5-9ab8-4639-97f4-1a978c0a71da/fujixisowixilojawurusuxib.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/vertical_navbar_bootstrap_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12741c4-dd4d-4f64-b3ab-7f468de56587/mustang_racing_seat_covers.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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 5212 bytes
SHA-256: 71490999f9d4fce4c48b3667ad7d559b88162814dd5dba498852e6827242ed6b
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10912 bytes
SHA-256: f016b0ed71267be8473d52653bdead7e8b55f353e854d126fa757449fa2b0030

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