Malicious PDF — malware analysis report

Static analysis result for SHA-256 3664f6366344c13e…

MALICIOUS

PDF

70.1 KB Created: 2021-01-06 10:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f011299f166d3a35d1795579ff8c3aa8 SHA-1: d1b91f2bcef185ff821e5c09227dfda65c70610d SHA-256: 3664f6366344c13e60d8b47b18203138d1379061e4c19ab696bf0e1712a60bab
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://gettraff.ru/123?utm_term=brio+zento+bruksanvisning'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is 'https://s3.amazonaws.com/buxoparadazegu/constant_voltage_transformer_wiring_diagram.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=brio+zento+bruksanvisning In PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/mejobigurovekib-revut.pdfIn PDF document text
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/dagenaze_nujifaxapisalop.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/buxoparadazegu/constant_voltage_transformer_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0262ed-dd5e-4b55-a82f-2cb317a14afc/vanogidamudij.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/baaghi_2_movie_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/rational_functions_review_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6814a0a-ca49-42f6-bce7-6a8f34f8081a/xajujusapivulimukudegu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/fuvegimes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3659ab6-4a8e-4a73-abf2-e48fd152724b/95604037122.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/beretta_nano_guide_rod.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/coraline_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/android_studio_emulator_no_internet_access.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 5184 bytes
SHA-256: acdad3e22c80592040565afaeca3429fd5a331c223b96708a589e98ec32cc08d
font_01_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 2176 bytes
SHA-256: 981d40e7e1d9a1d31612f6b8036e86b80a12f624093ad504f6dd1f330ad8f219
font_02_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 11380 bytes
SHA-256: b778bec7559e6a3653caa283cd617293c6bf2b89791467cafcad9caffc897aed

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