Malicious PDF — malware analysis report

Static analysis result for SHA-256 b233f5a4ab36c806…

MALICIOUS

PDF

75.3 KB Created: 2020-12-17 18:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1e6b8fefdcb31eaca50749fa5778d78 SHA-1: 9228d4ce117ebb02c02eb9ea48a5dbdbe9c3bd35 SHA-256: b233f5a4ab36c8068ffc251cf9b6fd2101822c60f04be3594f8cbefd69b94985
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafftec.ru/123?utm_term=how+to+get+imvu+credits+for+free+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5f8cb88727c24.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/5def1349c2c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fb847fc45617.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/putelekireza/boeing_757-_300_condor_fsx.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe427bbc819f1cf4a4bf09/1606304379826/sap_s4_hana_fico_training_material_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/action_photoshop_sketch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd50f9a-ca4b-4f8d-8bf7-c4e1045f131f/51133466238.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc554acbd14ff0dd2ba05e0/t/5fd1c539ef89ac6683769fb4/1607583035915/6016074678.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/battlelands_royale_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3d6fce-80e7-42ee-8e33-b5f962eb9e60/29207872754.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a28aaffbf90a66fb884b/t/5fc8c065b0f45b2a3d2cf6b8/1606991982177/67621112737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88281ea3-3898-47a3-b159-89b0e7a577b6/uncg_canvas_instructure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b04692-8218-4436-af95-59d5be3b3ba6/69939882186.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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 5484 bytes
SHA-256: 5012462936f5de67d06fa108a7a6407f8cb5aba775f6552739f69e2338be5a33
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 13348 bytes
SHA-256: d58d07e382ba28ef52d71b604f16f9c847d231c516e3f26743c7e36be732e970

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