Malicious PDF — malware analysis report

Static analysis result for SHA-256 01862644a90efc48…

MALICIOUS

PDF

72.6 KB Created: 2020-11-10 17:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1aa21195d917ccfecab7fb1b4dde8a3d SHA-1: 8120bdfb6e997999737c11d758206e2cdeb30f1f SHA-256: 01862644a90efc48a64a3a314a8e4b43e68071753f52fc291d3c0b6f91bf0adc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the embedded URLs, 'https://traffnew.ru/123?keyword=cuk+stratos+micro+gamer+pc', is directly associated with the document's content. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or malicious content distribution attempt.

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://traffnew.ru/123?keyword=cuk+stratos+micro+gamer+pc PDF link annotation
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/cf1ee66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fa48a62d50c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f96e2e848389.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/a919aab12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5faa203e2c3ae.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/rarigitipes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5fa8a69a11d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5f9093c050663.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/vonusirukete/fishing_guide_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a37ddc-f5b7-4c9e-ad42-6912d03cd531/tufopan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 5188 bytes
SHA-256: b9b04e6399de138b7672afe892b0874a95d721d6ddb3212d5f0a1596907f102e
font_01_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 11204 bytes
SHA-256: 0e14ec00e39ab5367c2440c953c5078eed600a4cd85c81df8764385265557e50
font_02_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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