Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbf30b18f5166ec…

MALICIOUS

PDF

72.8 KB Created: 2020-11-14 15:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bfe76f0c71fd53f5bdda616e9dc24348 SHA-1: 17a9e451bf40b291c10243a57eabed892d746e47 SHA-256: fbbf30b18f5166ec43792366dce7975dfdde7ca63f34aa96337f640707e5e879
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including weebly.com and traffset.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=skyrim+se+crashes+on+save PDF link annotation
    • https://zufeburiz.weebly.com/uploads/1/3/4/3/134320035/ca2a0c4fd.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/xudota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f8bfe6fcfb59.pdfIn PDF document text
    • https://xerukarikudi.weebly.com/uploads/1/3/4/3/134316935/tifuwidubabosidube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8a08436e827.pdfIn PDF document text
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/gegore-dosijomosut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5f8c740c894e3.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/pafiganovavi/tokyo_guidelines_2018_cholangitis_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/gewezelirapamijem.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/excel_vlookup_function_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/legal_advice_free.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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 5336 bytes
SHA-256: ca14de52b866c636746ae37299534699e51f2ea98e96147f9b0ef33c3740e7e6
font_01_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 11080 bytes
SHA-256: 84b7733457f94a1bd6e4e31518ca51d685f9da5814e30abe4de015c4dbeac12d

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