Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c5af9335f10b91…

MALICIOUS

PDF

67.4 KB Created: 2020-11-16 21:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f08a453cca05495b5354467fe6e92f3e SHA-1: 18833ef254d03721d8aadbb9943047dae8f84e27 SHA-256: 26c5af9335f10b91d9ba5b146770c9a3b1359865394df68bb6e11963819d64b0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=feeling+is+the+secret+neville+goddar In PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/c98b341.pdfIn PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/e94af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f88bf8a4bfff.pdfIn PDF document text
    • https://rilofope.weebly.com/uploads/1/3/4/6/134630674/tiriwesiz_mujawasun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5fa5e523b5371.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/e93c159c-1d2a-4261-bde2-46ca90eb9180/suwaduxozet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e94716-d866-4b15-b3f7-0a14ccbf2e0b/40520053450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556037e1-2257-412c-a148-003830f39fa6/fojuwofapegalataba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6843ef-77a1-4c86-a922-e6cfe67dfa4e/vevevupolap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f76d7d-2f22-4e39-ab0f-41bd325b69e2/after_effects_wedding_video_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fa1e53-a0b2-45bd-b091-4f1a58d5171f/33336221999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f12f0ee-65f3-4bed-aa07-26dd5b96176d/21889380451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e94f7d6-b555-4f37-bb3d-f0cbea37312c/46071563303.pdfIn PDF document text
    • https://www.goodreads.com/book/show/11485130-feeling-is-the-secret-1944heIn 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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5216 bytes
SHA-256: 098ab943c694ffe330a71be70721056bc8a26743be048fe724d4af73982dcc45
font_01_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 11292 bytes
SHA-256: 23ce4aa9dc0446247e6e82fe0f7a3219f03b6dc05730a5c04bee4ba74120da03

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