Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4f2ffa2df08d9a…

MALICIOUS

PDF

73.1 KB Created: 2020-11-28 05:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7d353c231109b45a6466179fd89e6044 SHA-1: d77815029fddd93331b4220e054ac8582575e971 SHA-256: cf4f2ffa2df08d9adc263f849d7e858e12113b10feb8346d89465cfbb2e03633
156 Risk Score

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 link farm. One of the primary external URIs, 'https://trafffe.ru/strik?utm_term=what+does+the+word+oppa+mean+in+korean', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=what+does+the+word+oppa+mean+in+korean PDF link annotation
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/4261.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/2e97b.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.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/01d1d9ef-57ec-40af-bbf0-69f419492b60/balutofogakunarilod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8828fbf9-94e5-4f9c-b44f-cefcd5df9847/5433687027.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/burrraahh_song_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2fe627-e708-4d47-9caa-11f1f215b925/dafage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80882ef4-33a6-4bd4-9670-c9fe536f6f1b/logifomenabijomilore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266ad3aa-5c85-4474-82c5-0cd357ac60d9/hp_photosmart_7350_driver_download_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ba3898-a06c-4a76-84ba-39e1b7eeb546/lesisixaxebure.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/rerowavozejazago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aaa61c3-00a0-4925-81f1-43ac33658207/99775587396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bddbb4-ff95-41ed-8c7d-b9dcbd1ac8cb/55443598071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde5c51e-e550-445a-a9cf-64356cf53fe3/dubefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f7cf7f-cafd-4606-9a16-09a287bf633f/texas_property_and_casualty_study_guide.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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 5336 bytes
SHA-256: ec3d783c28418f1d5f6856ba37f7f2e12810e132de6850c511a014860fd4157f
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10152 bytes
SHA-256: eddc174f7785f2438a9edbb6e9c7d925ed88f0c1e07d9aa2fcaae25df52a6cd8

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