Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ad5abbd5e4c859…

MALICIOUS

PDF

75.5 KB Created: 2020-11-17 18:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a330e52e6155771a26a2e18ca27809eb SHA-1: 848c687137b23e13c4e87953e3ac58f322a0ed97 SHA-256: 58ad5abbd5e4c85912e838b4d02459dd2204eecf7942330a1eec7485aada2fd5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous external URLs points to a redirection-based attack.

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=bethany+college+football+wv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f9b3d565ab80.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/lexejeku.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/9d2b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f8fb5bcd4345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f87f91a83b6c.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/buwoj_xeresiduk_bubadizi_gurufoko.pdfIn PDF document text
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/juvabuvev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f9c6577b0a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_5faf4881dac9a.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/waguwawasolaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f87659689cb7.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/susopuzupure/99577396198.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/acido_acetico_vinagre.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/math-aids.com_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/turiwi.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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 5312 bytes
SHA-256: e29baf90fc0ca264925222e58721e6ab8d83bb62127dbb33dd19a64c0b48decb
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10544 bytes
SHA-256: 5f01799f62e43764866facc088cd55ba7d1c4e95e8cde4cc45fcc68b44378879

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