Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc89aaf7bbaa04f3…

MALICIOUS

PDF

68.4 KB Created: 2020-11-25 07:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a511567add11fad89e9c5c9d312c84e2 SHA-1: 1c7e65d8c1eb5586a8e244a679ca9bfc034e850f SHA-256: fc89aaf7bbaa04f368c7d111d8e75eb99cbc8f704e01841234104ea4182c76c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards malicious activity, likely involving redirection 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://trafftec.ru/123?utm_term=civil+engineering+handbook+rutgers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5fa253f74253c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5faf885107895.pdfIn PDF document text
    • https://riseriku.weebly.com/uploads/1/3/4/5/134585500/1f663c42864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_5fa7a1d8bfb71.pdfIn PDF document text
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/cfedecc2972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_5fa77c65e18bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f96067635934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f923468976d4.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/bexolamabad/simelijoluwusorom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3370d0-e668-43eb-b66b-6001e2dcb381/78098386282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6dc54e9-8563-4b1e-9a43-b049f8cbbc30/tovuzarirunekobukupaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c3fdfa-9bf1-47ba-a271-90d535abc453/imperial_march_virtual_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a59740-7387-43ab-bb1c-e34182e3eeb7/nififotaruvod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5386c0-aeab-4e6e-a121-a69c098d1335/nowiwes.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_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 5256 bytes
SHA-256: 1389f52cab09264c07c72338772f57f065b1b7f0b58cbb30b14c355982d83fe1
font_01_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 11144 bytes
SHA-256: ddd35e0009c8ab4fb884bc12ac49b4535e8c0c3923637fa41ad4f8893be621d8

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