Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef93fad7a62bef3d…

MALICIOUS

PDF

67.7 KB Created: 2020-11-19 07:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3080bcae0c3a3698fe650e08999aa963 SHA-1: 53189f15a22eabc23317ff454b4e53d43a9da031 SHA-256: ef93fad7a62bef3dbfa8c2250f2de7472647591dbdc2a220f1cdd3182423febf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URL 'https://trafffi.ru/123?utm_term=slab+coffee+table+plans' is likely the primary destination for the phishing attempt.

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://trafffi.ru/123?utm_term=slab+coffee+table+plans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fa1112e0cb76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5faf6f4b1609f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fa6ffd364102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f94208f57200.pdfIn PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/4d521da47b9c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f8c43cca5620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f9158f66d2ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5faeb8cc02c3e.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/9cc63692-7516-481e-86ad-89f2e1a14a51/zexibevenibis.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/yo_autoestima_y_autoconcepto.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/51929662918.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/12683881502.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/intern_survival_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/graphite_material_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f1652b-5ec0-48b9-9ad3-ee93d3cccd6f/water_chemistry_mark_benjamin_solution_manual.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_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 5156 bytes
SHA-256: 2391a840e4af192d1bf2ca460f7c4f0613901bfa73a1f9a5305960bda9c1b533
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10364 bytes
SHA-256: 414924ff70acb1b5df2586e95205fbb96d8989caced93d3caf1db80b912acac3

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