Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f5299447d459fe…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 01:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c8b9e08f89feb96cf1f2ecd6e8a0e0 SHA-1: 5165d06fbfbe7d05adda3ec71e9f641bffec3e1c SHA-256: f2f5299447d459fe776b1e2a44ed7aa2416d36bb559973dabfce4066c3e9059e
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 SEO-optimized and point to potentially malicious or spammy content. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs suggests the document is designed to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=2006+scion+tc+manual+transmission+rebuild+kit
    • https://cdn.sqhk.co/kakapoxavu/89giigf/file_manager_app_android_free.pdf
    • https://cdn.sqhk.co/nomuzali/hijgVZX/real_mathematical_analysis.pdf
    • https://cdn.sqhk.co/baluwofuk/GDAgGgg/resident_evil_3_safe_codes_ps4.pdf
    • https://cdn.sqhk.co/liwijodi/Xtlghog/million_dreams_piano_sheet_easy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxekojojexusol/what_does_the_okay_sign_mean_in_japan.pdf
    • http://nisuxukiw.epizy.com/protect_a_worksheet_in_excel.pdf
    • https://uploads.strikinglycdn.com/files/5d221ebb-8323-44f8-8fd6-12966e2f9422/what_are_the_6_elements_of_design.pdf
    • http://gofosuxubajo.epizy.com/alcohol_fermentation_lab_report.pdf
    • https://s3.amazonaws.com/fofeguj/kolutubo.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4d34cea5c23d4b8da1a30b1e659870f2.pdf?index=true
    • https://s3.amazonaws.com/xesigeze/97937203499.pdf
    • https://uploads.strikinglycdn.com/files/71450d5a-2744-4770-ab3d-d0fe92c0a236/what_is_lambs_book_of_life_in_the_bible.pdf
    • https://s3.amazonaws.com/xupimaral/61330989748.pdf
    • https://uploads.strikinglycdn.com/files/a7b18f23-744a-4868-9884-fd84da277553/xomiwux.pdf
    • https://uploads.strikinglycdn.com/files/c033379b-7a6f-4ecb-8635-9d5c487e3837/zamamufovine.pdf
    • https://s3.amazonaws.com/sabobenuwe/98219598208.pdf
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_29604e275dfe470d9db0e007c417a7de.pdf?index=true
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_696637e7a2224ddaa06465cf4d955e3b.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_1acc63c2224f464d87531533194f51f3.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_fcae3adaa5114050aecb5fd1129bfc5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/968ced19-35c9-4cf4-99a6-e5a783d90af5/nespresso_vertuoline_troubleshooting_blinking_twice.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fb.bin
49bebc8b5687026154470e81aae05236ecca56738647da6cd816278b40ebc74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5620 bytes
font_01_sfnt_off0000faf6.bin
9195babb9b9f4510adcae78889cfffc1e7344aa296e9d76fc27dff6c5c5ce459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 11476 bytes

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