Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f3f86d77c5f8a…

MALICIOUS

PDF

73.9 KB Created: 2020-11-20 20:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1ff2e0a043e0807d8a6adca10298a1e2 SHA-1: 43a8bafd12a572811df1faf6e8cd0710a21bb039 SHA-256: 663f3f86d77c5f8a88ec97727582264a4ff0b079ccde4f9e40344bb2f6c4283b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which are disguised as tutorial or manual documents, suggesting a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=autodesk+inventor+2019+basics+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491426/normal_5fb298616ee2d.pdfIn PDF document text
    • https://lebidupevi.weebly.com/uploads/1/3/4/3/134319251/1693412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87548a41d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5fa667824437a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f93969db8e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fa8ac281ec2c.pdfIn PDF document text
    • https://bexemopifap.weebly.com/uploads/1/3/4/7/134758506/5646950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f908157eec62.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/debamijizozexo/mujujufalawadesofuduxonix.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/15326392635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9eef47-c942-49cc-8f39-36cd8f317eaf/servio_de_monitoramento_de_idosos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831207ee-a227-424f-ac82-2a0b51508dd0/john_deere_160_mower_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/online_antivirus_scan_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/how_to_delete_minecraft_account.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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 5884 bytes
SHA-256: 179de976b3a7a02a153ced0a3dc056c6e7c3e8bf31dbbdccba5fc6a62d002c17
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 11856 bytes
SHA-256: e8c87a553060b8f66b3eba134bbb713d735153187063b7c048c4de026a4a5837

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