Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d94be1fa76f1dfb…

MALICIOUS

PDF

93.0 KB Created: 2020-11-30 15:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d8aea692d610dd330797576ac2346705 SHA-1: 928e2ff6be6f402009565d6a5a1ccfe71173cf1e SHA-256: 4d94be1fa76f1dfb29f8f922c30beb79e83a37212a18f26c0eb3f9eaff98517b
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 0.9995

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=list+of+ly+words PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f89796eb5368.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/7237958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0bb6f3de5e49b52b7447/1606290358996/14350662749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84226d3-fbfa-4396-8a80-25378da4388c/solenutigulotem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d682fd4-76c1-422a-aacc-28a7d3e8409e/desivibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3689de0d-5b25-4ef5-8188-f53235d7180f/jexiwepudugog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2ddc58-787c-4c4b-b977-e490c7ad3c95/teputomejimojijobiraguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bbd89f-0e19-4f5d-a062-b17a27e5a002/bimug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e7c130-f079-40ef-b3fe-a87fad03f4b0/melunudikodosufaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf2c665-ebfc-4cc1-8395-6f8f5a75f04f/96158216434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39da5aea-02f6-45c2-bfbc-b07a28209d7a/75204749049.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19fdcbd14ff0dd2a1cd42/t/5fc2fbbb9d79364840f09886/1606613947785/jikix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c8d5e9-b6fc-45f2-b789-cd4218ce3c6f/download_full_movies_2018.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 27420 bytes
SHA-256: 69b81f5260735da12f57426f44ce46aa775645b5c6a19368f2dff4680cd6dbc4
font_01_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 4388 bytes
SHA-256: ae745f34c4a9f83538d9af56c856781c8826a43c8e2f1f2f4353aa7ace1979ba
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 11428 bytes
SHA-256: 26b731c52eb0c0c6de7dbdb0269d16cff23d3ae16ce01b760d2b602c5cf5f221
font_03_sfnt_off00015944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15944 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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