Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409ab635099be37…

MALICIOUS

PDF

69.2 KB Created: 2020-11-26 08:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: eb2565f6ab75644599e6dd4899e09f6f SHA-1: 86d65c25450951f79eeebb236017cd15a02af6d8 SHA-256: a409ab635099be37f442b536efde738055eb68680c10d4f6526703e723fb9c9d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to obscure the malicious destination and potentially engage in SEO manipulation for traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/strik?utm_term=tube+jumpers+unblocked+games+99 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f8e40478d6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fbe1943acbdb.pdfIn PDF document text
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/2641305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5f9b8e7a1d1d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f8fa0d45269d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_5fa862eb77916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f9097254987b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_5fb6b68f32f3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gateme/andrew_smith_md_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97da6a3-e4bb-4046-b6c8-a0e3b6170e83/warframe_how_to_increase_mastery_rank.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_off0000c55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55C 5532 bytes
SHA-256: bfc2748a918f94ecde2d45670882887b8df995a4b09e194379e62113669dc059
font_01_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 10088 bytes
SHA-256: 9c47beeb089e46610645f787f2047ca1754fadb694e2e352b96f2506de7da3b5
font_02_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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