Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7ddb4ebbed070d…

MALICIOUS

PDF

66.8 KB Created: 2020-11-14 01:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a9c515c02df3e1389cb5c6cb9a4c469 SHA-1: 7b8f8e7b165f4b852b36c141dbddd1ef17543808 SHA-256: 6f7ddb4ebbed070deec0c54f1e5cd798245ba9b302c677bdc0441cc1a1ee85c5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'trafffe.ru', which is suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to potentially malicious content, aligning with phishing or SEO spam tactics.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=oxygen+not+included+cool+steam+vent+analysis PDF link annotation
    • https://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/9131348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fa11251c41dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5fa9050413d9d.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/65b35dd5-5bae-453a-a0ed-df1c03ba536b/nepukalakiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/vujawumarebolexopuferasir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c931b1-bd09-48e6-ac92-67326382ea6f/real_estate_co_broker_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/36186674837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de5134c-098e-4a7c-a8fc-5e717c511442/aleksa_la_vie_beograd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de71c3a-4de7-452c-8911-f4ac48649df9/free_user_manual_for_kindle_fire_hd_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e16e51d-a9ba-4d05-81de-a9b278ccfa16/60641533509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cdf163-834a-4b38-8285-4d6bc92a1378/55378002333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc0e364-0551-4c44-baf5-dd59f49bbedd/sidewinder_bobbin_winders.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5420 bytes
SHA-256: 172e60996746ab960b2aecd837a377211bd609b14a239b1a8824666cd0ea8520
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10056 bytes
SHA-256: 157a05dbcbdfaaf3880451b07dcc0b25a5e028d1ee3d330279a36a6c9f421a15

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