Malicious PDF — malware analysis report

Static analysis result for SHA-256 e751c47b7d232840…

MALICIOUS

PDF

69.9 KB Created: 2020-12-17 07:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f05a4029319387400ca9a3c26451e1a8 SHA-1: b943c771f5071d1c243d305bcca1b4b57a37b71b SHA-256: e751c47b7d2328409c206964707018f602ff0fe07dcee03ea716e96c3d03be64
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 multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains an embedded URI pointing to 'trafffe.ru', which is a strong indicator of a phishing or malware distribution attempt. Although the document body is heavily obfuscated, the presence of the external URI suggests the primary attack pattern is to redirect the user to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=days+inn+by+wyndham+baltimore+inner+harbor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fb73c3e2cd29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f89dd507f5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5fd65ab488a0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fc62fd5039bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f941b4017bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5f9cb33eb1f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_5fa26188d0584.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/9bed9058-7786-4575-97b8-e0fb08cb917f/97781110378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92078371-3245-4fc4-a5af-047598182c26/the_art_of_stopping_time.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/codycross_answers_group_29.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/free_christmas_email_templates_for_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89a12aa-3dc7-4f08-b11a-ff996acf5dc3/download_freecell_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/sql_injection_attacks_and_defense_2nd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56d9988c99b6d37c5c202/t/5fc708ab6beae454315c6599/1606879403639/luzobijuvinukodivijobor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fcce7ef662d5e24e0a26310/1607264242640/can_you_drink_bubble_tea_when_pregnant.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_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 5400 bytes
SHA-256: 529c2b0fc7de0f869a9cb69a8a6e8580ddeb5d527730191f47a42dd4868a73d8
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 10768 bytes
SHA-256: 69e83bb48d713cb352f2bfb0be11e09c103b45f346d50881b0cd1d8b0d434355

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