Malicious PDF — malware analysis report

Static analysis result for SHA-256 099ddaa22f85ffa3…

MALICIOUS

PDF

66.6 KB Created: 2020-12-18 14:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e22ce12bab9abfb672760fee26eec40d SHA-1: a9f31f3814002f00101c7f8f56867e2c68d6fe01 SHA-256: 099ddaa22f85ffa3d9f8f458a89076ff12590d651b22e57a9d77dffa72c5127c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/aws?utm_term=free+editable+graduation+program+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5fd7a10a02ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_5fac0a14a8ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8e7095dbadb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f89ecf72e01b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f9776e6b81d0.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11198201-bce9-4b2b-b16e-8fbf9d881beb/ghostwise_halfling_5e_silent_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d68b04-2253-47b1-b291-072d1b1e41b2/96662495245.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/61409914789.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/allegiant_free_2shared.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e1448ef7301f8b1097bc/t/5fc21baaf3de5e49b5ac7c02/1606556589612/55394190446.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc368199955c744b54b807d/t/5fce016e33187724c416e2c7/1607336303140/detotuj.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_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 5196 bytes
SHA-256: 0293ad3ef2207513b67a134f3abeafe22aea7f181f05ef295e5cc5430e2b4425
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 11076 bytes
SHA-256: 2e78019deab6a83fdf90b5f0749988b0c9eecd9c9807de7f21928ca21be34c1d

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