Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8d8955d3064fb7…

MALICIOUS

PDF

63.3 KB Created: 2020-12-04 21:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2104d251c5e01385a990cfda0bda9cc4 SHA-1: bdc7e22b4f6a0b127f14e6102a4676bee0c2b34e SHA-256: 0f8d8955d3064fb77d74f37531aa92d48fa3b00a6e98f929523c9bc82efd701c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, indicating a link farm strategy. One of the primary external links, 'https://trafficel.ru/strik?utm_term=city+lights+fresno+address', is flagged as suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=city+lights+fresno+address PDF link annotation
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/4283682.pdfIn PDF document text
    • https://vogunuwar.weebly.com/uploads/1/3/4/8/134887333/xomupimaralo.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/bd3b6e405cf22ef.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://uploads.strikinglycdn.com/files/c0626841-1be1-49a2-ba43-35f9be88ded2/aphasia_goals_and_objectives.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50d5d084698658e78fb81/t/5fc539404f9837572088be05/1606760773887/linirimofurovabuvexebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58a78ed-467e-4d79-98db-08818b0c9674/carnatic_music_tutorial.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc106d1bf71053ccb10e0e5/t/5fc629b53c02f22b9dded13b/1606822326563/lebaran_haji_2020_bulan_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b1804e-d6cf-4616-b736-f5f9dfbaa7ed/circular_aperture_diffraction_formula.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf541e3c6ccf69f3553d09/1606374431911/gedewimutiluk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb1ae9fc3622d51d09b9/t/5fc0fc5518e72e5fdbfa7122/1606483029876/3800305953.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c774116eb00e3c6d76f8/t/5fc6ce26bfb90028be3d4daf/1606864425748/54843860334.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19eb9f7cf8c75403006e8/t/5fc34e95a97599144e61f8ce/1606635157890/west_bloomfield_police.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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 5080 bytes
SHA-256: c485b7ae14d95c7e8f029331ee2739684e1f06c734a6578a1e0f3a07f0abf45b
font_01_sfnt_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 9768 bytes
SHA-256: f8aa61f6a23c62462430a4607bf2d130aed872fae05a807d5ceefe2cd3c9123c
font_02_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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