Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b9c22e4e0b792…

MALICIOUS

PDF

66.1 KB Created: 2020-11-11 21:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f327360e951a1b840e05b498cebe6a1 SHA-1: 1eff9bec4c9239a9c472503d478464bb35954ae3 SHA-256: 951b9c22e4e0b792d0da6d9528bb39faf4034d1273d0c65dd53c518822cbb904
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document's content is designed to trick users into installing remote access software. The presence of external links, including one to 'trafficel.ru', indicates a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/aws?utm_term=apkpure+er+for+pc
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5faaec45e1c9b.pdf
    • https://kukevukoleguko.weebly.com/uploads/1/3/4/2/134265740/15c59.pdf
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5fa16ca186806.pdf
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/wibupejabobele_tevefipesonod_mubunubepinova_jatutox.pdf
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f9f3176d3f3c.pdf
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5f938306da25e.pdf
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f89627b32175.pdf
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5f9d054e1b7d8.pdf
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f93367118017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a344207-00c5-4895-a993-d94634375ca2/megutulodobuwovemekis.pdf
    • https://uploads.strikinglycdn.com/files/4b326f0f-ad58-4474-8b92-30c616308704/catalogue_bergere_de_france_2011.pdf
    • https://uploads.strikinglycdn.com/files/4f01f52a-1d69-4a45-a8a6-894c85f3e88a/45916111304.pdf
    • https://uploads.strikinglycdn.com/files/b9876491-443e-413d-bf2e-dc669e38c9e8/pixipuvanivowonipodikapam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd3.bin
b7be24cc8452bb8c48bb273a8429df1ba2ad0ca4813039781c0b8b6d89b02d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 4640 bytes
font_01_sfnt_off0000cdb2.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 1936 bytes
font_02_sfnt_off0000d6f1.bin
d4d3e1990b51e9367b4513521c7388cdd84d61f9d98bdc875686eb8c2410bbcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10696 bytes

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