Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c84e9ac08f1d192…

MALICIOUS

PDF

68.9 KB Created: 2021-02-14 04:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 80be500cb8aa584ac221a3a7042dccc3 SHA-1: 775fc7777817ba98c952506cf9e32c80a2d94c19 SHA-256: 4c84e9ac08f1d192d24389033b566743c4dc77cb84886db198beeac937b5347b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external link farm are common tactics for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wb?keyword=state%20of%20texas%20employee%20tax%20forms PDF link annotation
    • http://mon-cmso.best/unit_conversion_problemsbtd5y.pdfIn PDF document text
    • https://jokisutenewaj.weebly.com/uploads/1/3/1/4/131483229/6483325.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/341455.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/9137696.pdfIn PDF document text
    • https://wexewuvaxodewo.weebly.com/uploads/1/3/1/4/131407465/sapomofufawases.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/bovanasija-lezed.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/6i7zDgg/rangers_of_oblivion_wiki_espanol.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/buduw.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/xaxedejawurolaf_nezagebelez_wexanibudofe.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/6981448.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/343407.pdfIn PDF document text
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/27c4d.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/3567700.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/rubidokezive/72368655274.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/45017989707.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_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 5320 bytes
SHA-256: 42e257f8083124be30e471528a983a6e118339e2d288cc05b63dd421116cd6b9
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 11112 bytes
SHA-256: 448accf0ab4841f45c078d247a54cec810c6f824d267d1dc88b6658e26b7b908

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