Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffb7444f8660a83…

MALICIOUS

PDF

56.8 KB Created: 2020-12-19 12:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c33c18c3e8d4fb8c8e66f54ac2f1f9d0 SHA-1: 9055e63b988a7188149c0c19fba4d70327936575 SHA-256: 8ffb7444f8660a834b229ec8573dc1705f44f31712e4ecf31e321b4973742673
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 0.9996

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://trafftec.ru/strik?utm_term=black+ski+mask+beanie PDF link annotation
    • https://pupedabakonarow.weebly.com/uploads/1/3/4/7/134709410/gujatofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_5fbc3a91886a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fb528e43e888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8a96c4760b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_5fd9a0950d328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5faffb668067e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee9ef3de5e49b5291c20/1606282911393/88330947569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1508a55a-0268-4b15-a4c0-a417b02358ac/notafufoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a6a293-9f02-4db9-9d1c-a80dcb6b2e8f/red_wing_boots_style_2492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db82ef3-18e9-4559-a031-06185edc29c2/printable_multiplication_tables_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfedd42-fdde-4318-b1a9-a5bf395aaaf6/disgaea_5_4-2_grinding.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce64aa0ee49e251fe8d005/t/5fd706d5267c8d0ace5dab2d/1607927509662/28080749036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1495ac-fc04-4a44-8163-b1e1bcb06947/husqvarna_viking_emerald_183_manual.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_off0000a7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CD 5100 bytes
SHA-256: ba76d79b76de0da6b42bfb4a2c9633c489587b10e1f9e49f675ade265becc213
font_01_sfnt_off0000b91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91A 8684 bytes
SHA-256: 8290578702ef303d55165ccc905ee808533928eeb7a21b44ae0190dc1ce0e48c

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