Malicious PDF — malware analysis report

Static analysis result for SHA-256 87796d576029c990…

MALICIOUS

PDF

66.6 KB Created: 2020-11-21 19:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 74b6a62faa7d60e6339fab1ab00c791d SHA-1: ea1bc7e4264798d46ee4c621509dfdbd38caf446 SHA-256: 87796d576029c990d5259b7d14292744940e340297bd384f954eed3da10a892a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=ti83+calculator+online PDF link annotation
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/riwaridotim.pdfIn PDF document text
    • https://xodunutejoxefis.weebly.com/uploads/1/3/4/4/134476009/1099349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fa9aaebaf113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fa2733c746b2.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/favaputuxepe.pdfIn PDF document text
    • https://dojarugakafep.weebly.com/uploads/1/3/4/4/134471698/fofasubaso.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/b7e72d80-943f-4f79-b7e2-3ecba84fb1c2/fingerstyle_blues_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e683744d-6534-4247-8df4-ba30631d8b1e/angulo_de_elevacion_y_depresion.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/82865163931.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/86077255027.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/judea_pearl_causal_inference_in_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/mevudoxotibokukiw.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/2933935333.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/th6320wf1005_installation_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_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 4924 bytes
SHA-256: 5a3f5419b0afec6a49b7f1dffcbf3ecf0251ede3d0b77db61aa4a0637c9dcc77
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 10152 bytes
SHA-256: 093f665c480aabd94f8a4676fd5d4cc111471f93606e3a3877fb0c9695766304

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