Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0c1553bc35bf8b…

MALICIOUS

PDF

76.4 KB Created: 2020-11-13 13:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 398f008b07d67b19246bfee9756d7c7f SHA-1: d991e35c1e8581db39e8e8d48fe4bc4d9ab74394 SHA-256: 3f0c1553bc35bf8b23b523e3f850da8d66e873c92b993aa429a2c9c5fbc7b770
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=world+boss+rotation+legion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fa5b5d981c1f.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/gigovofen.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/medodetanezi.pdfIn PDF document text
    • https://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/rojanelo-rididuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fae612f28c95.pdfIn PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/5753121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f8bd305b5ce7.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/dekorijusopijo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wunojipu/microsoft_azure_cloud_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/12989430819.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/valley_car_wash.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/timex_ironman_triathlon_watch_wr100m_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/graphing_parabolas_worksheet_algebra_1.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_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5144 bytes
SHA-256: 83a62abcc571c2a8a3e0977e158db6e699947d9e947f2d87033f2639241f9fb1
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 11344 bytes
SHA-256: 1a4ba9caeb31d67e42170ab8db7030d1f90fe01044843f64f391b0622a974725

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