Malicious PDF — malware analysis report

Static analysis result for SHA-256 9375adffa3f9d3e8…

MALICIOUS

PDF

67.9 KB Created: 2020-12-22 12:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 701b76f4d81eab9758337b96e8b51d88 SHA-1: 38b4c190a561133b2f06cf5771d09d9295026cda SHA-256: 9375adffa3f9d3e897dfc9402ab3f00fee2a342d2421fd4cc5469ae536fcb0e3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to redirect the user to a malicious site. No scripts were extracted, but the presence of the URL and the high ML score indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=all+text+structures+and+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fa41f88d094c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fba6523b6265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5f9ee32e07940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_5f955f310af8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_5fbbe63aa9d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f9a394a9cb1f.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/xotomisen/malformation_de_la_charnire_cervico-_occipitale.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/johnson_and_johnson_annual_report_india.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8fc0b6b03258f35503a/t/5fcdb47e83d2ac65cc31affb/1607316611077/kivuwosejawukekujogi.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/52046884766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d641a2-9dcf-4e45-a1f9-5d905ae29d28/34204233954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e00926b-3e1f-4ed5-bd1d-2cad5ce7e3bd/bowobewapudowifejog.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_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 5276 bytes
SHA-256: 3800f3b9988245fc80329f90b2d471a059f92296d3fd47e3e7fa91f37d4cd7d8
font_01_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10892 bytes
SHA-256: 321f1617273069110ad98d1dff9968694159f470ef345a580177c642f24e6cd3

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