Malicious PDF — malware analysis report

Static analysis result for SHA-256 8051819e1ec0b2a9…

MALICIOUS

PDF

72.2 KB Created: 2021-02-05 09:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 36c22202ce9d273405e16cf1cf19021a SHA-1: 284af46f4790fec42fbd8b7a88e3c85306ab7950 SHA-256: 8051819e1ec0b2a963a521e73af1fc05faa2fa045fdadc9be15570be5cef643c
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 as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://druttle.ru/wb?keyword=low%20back%20pain%20rehab%20pdf PDF link annotation
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/kujitesigumal.pdfIn PDF document text
    • http://naturagrush.space/57116461727cwad6.pdfIn PDF document text
    • http://logoped-samara.ru/topedixukugakojenu91awz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_60130aec4a1e9.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/0561094e0a.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/3687875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411683/normal_5ffb75f19c9f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5fe1c7ceebf98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb362a6e161.pdfIn PDF document text
    • https://muverepifakapi.weebly.com/uploads/1/3/5/3/135387058/6381087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_5fd957c7d5eb2.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/kixoba_govusekobilozum.pdfIn PDF document text
    • https://xokumosub.weebly.com/uploads/1/3/1/4/131408432/3692088.pdfIn PDF document text
    • http://maslovauto.ru/instax_mini_10_manual7a8xy.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/mituduzolaxubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5ff67b61948a0.pdfIn PDF document text
    • https://sujixiku.weebly.com/uploads/1/3/0/7/130739139/viraw_vonunezadoj_gewapuza_nefefof.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/zegojadaguxiligi.pdfIn PDF document text
    • http://epaytds.xyz/metasoxtiiu.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
    • 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_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 4976 bytes
SHA-256: a52a68f6f5041bd07a5184b833bad9fac750d79d3c9e85c0198c13b9a0a2dd30
font_01_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 10320 bytes
SHA-256: f63c1fe8d9dbd0082c1b03f0459fd7b8596a843cc07eae4846f6dc3cc6ad0f85
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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