Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be6ab6f72fb99d4…

MALICIOUS

PDF

59.4 KB Created: 2020-11-26 14:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4991a245c4214ab9cb24e900ce9f929f SHA-1: 14a0476e051bc41285a5452af1e9c5a62e115254 SHA-256: 5be6ab6f72fb99d4f11e856010c30aa3353d26be2d0cdd42b66c47e57253b462
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, including a critical redirector link to 'traffmen.ru' and a link farm hosted on 'f-static.net'. Heuristics indicate the PDF is a malicious redirector and part of a link farm, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

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://traffmen.ru/strik?utm_term=ain%2527t+that+america+youtube In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5fb955c09a6ba.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/rulin.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/podufolagevonu_moxedogepulakus_rutapud.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/mirikaguxaguxekipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5fa52e7b787d3.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/pijukawadotegulereda.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/1e0516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_5fa3cceba4c1f.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/kotujikexuworutusum.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/baxekojojexusol/53018040447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f2620a-f3c2-4603-98e4-6bfd01937b86/befekowezukirujow.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/index_imperium.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/salesforce_developer_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/wigonajebadewexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec51e1b0-9d0c-41d9-8927-74033ec6524b/boligilunujolididakuwew.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/biodiversity_and_conservation_file.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_off0000af7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7D 5096 bytes
SHA-256: 55bbff9e5f692f3de24741cee393157d7768d0ec826fa52fbd1b4bce31568f04
font_01_sfnt_off0000c0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B5 9392 bytes
SHA-256: 9790d017a5e4f4988d01d81fd82efb19b115f714f8055db8972717eb04965303

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