Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fd0615a55c04eb…

MALICIOUS

PDF

60.7 KB Created: 2020-12-11 08:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 311042efc073c101af2c3f1002e62d63 SHA-1: 67a9f34170460417f67440a916ba7eac40dad5bf SHA-256: d4fd0615a55c04eb0468ef01ca5455d5b6434edd32fe081724cd38f5f3fd0d08
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, 'https://trafffi.ru/strik?utm_term=mermaid+scale+fabric+hobby+lobby', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=mermaid+scale+fabric+hobby+lobby PDF link annotation
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/d4473996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5fc5f4cddc043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8701d080cf9.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/9025d00f-7423-43f0-9093-c7c91de256dd/64159332068.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/scert_kerala_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9eeeb07-12a5-4d0a-9149-5d0f2c97665b/27891884952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42854ad0-e17e-4866-afea-fd71f58f74f5/my_hero_academia_dubbed_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/since_and_for_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/xuvidofagudasujoxutiwedep.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/wofup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0315dae50a014588204c/1606222615360/distrito_escolar_de_chula_vista_telefono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35b2fda-e2d6-4f48-9888-95ef9167446d/mibom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0b7661e25426e1002d79/1606290295771/42903738411.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a1fc2cf09257bd77158e/t/5fc65d9b9ee0f32b872dafb3/1606835612355/basketball_shooting_game_unblocked.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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 5508 bytes
SHA-256: a004d5b786d0b53eeddbe281eb95cd043d58628fa8063563d976ace1bdb0116b
font_01_sfnt_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 9852 bytes
SHA-256: a5b96e9a810282cc52ddf27bb4b751fc38e6186d80842eda7ba8adbf74220214

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