Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d106b839e87f2d…

MALICIOUS

PDF

63.5 KB Created: 2021-01-03 10:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb09d91172a02a7c83ed1e56f771d920 SHA-1: d0ddca687a48a6d904467f0d17dde07d8f60001b SHA-256: b5d106b839e87f2d422945fda3862cad0bcc024d6bed871d1f33bec4f5152656
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded links pointing to external resources, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, and another flags the PDF as containing a mass external link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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.
  • 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://traffine.ru/123?utm_term=columbus+ga+youth+baseball In PDF document text
    • https://ponopuxebi.weebly.com/uploads/1/3/4/3/134365602/8480295.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/C7mmHhe/counter_terrorist_shooting_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwejujorod/Fihgbif/59435858952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_5fbafcbcaedfe.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/giKgdjf/21240280220.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/2feb611a-cc36-4e9f-941e-6f29917ec968/rugavudufomeluxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/nagasivejuxubifivob.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/super_mario_3d_land_rom_google_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/30133501154.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/angular_1_vs_2_performance.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_off0000b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90F 5148 bytes
SHA-256: ce15d97c507b7397f199557dd5c07381b71d2ccbeaab7c8080277a216db9d69f
font_01_sfnt_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 12264 bytes
SHA-256: c32b1bf4a0c388c0627155b4161e64cc6215b5eb1d299a7b13efdce2acc80902

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