Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5e7716bb760c14…

MALICIOUS

PDF

68.8 KB Created: 2020-11-10 13:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 25a63008abb6ea84032e9bdf45c43833 SHA-1: d811259545275842b76ab477e6c50e3612243776 SHA-256: 1d5e7716bb760c14e7afcc2d9455a50dfb3b2976481f3e07507ed4b595e3bf6d
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-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://traffine.ru/strik?keyword=public+health+nursing+book+9th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f9c4923b4231.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/bilodosux.pdfIn PDF document text
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/xasikuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5f9f55d8cd098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/vifurijopunopupogowuw.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/poxikurunefekub.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/double_sided_variable_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/44793793664.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/kosudusegenubapapewedi.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/average_property_taxes_in_columbia_county_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/curso_automatismos_electricos.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/82993397757.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/liremisoniritanamav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 5660 bytes
SHA-256: ca4ed8e15c8f3458cd473829f06129419b9fe529e18c8a095bedde7e747db7d5
font_01_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10028 bytes
SHA-256: 052433519490f30ce645e2b313eed5a2a6ab0df0ba1c97863be1e67c0f27c49a
font_02_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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