Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4226d4844b7989f…

MALICIOUS

PDF

79.2 KB Created: 2021-01-24 17:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d8ad1e10ccbb05d4db69b0aa3256d78 SHA-1: f3ef3a486f687df1df4101bb9fddb5cf68bf020d SHA-256: b4226d4844b7989f4cb83caf28ff0b9d85aa21b6529e80ef63d6ca5626d7f736
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links pointing to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing lure text was clearly extracted. The primary attack pattern appears to be the distribution of a large number of links to other PDF documents, likely to manipulate search engine rankings or redirect users to malicious content.

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://seumenha.ru/wb?keyword=candy%20movie%20houston%20soundtrack PDF link annotation
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/8272498.pdfIn PDF document text
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/lugowenemuxobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff7bfabf03de.pdfIn PDF document text
    • http://goldstein.capital/aerox_3_wireless_release_dateafyqd.pdfIn PDF document text
    • https://fukoroxovelamos.weebly.com/uploads/1/3/0/7/130776486/3db29.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/eicjhhg/54417000968.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/ae797bb541dad90.pdfIn PDF document text
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/lotozunitaxav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5fcaf3afe61ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5ff75e9b056d8.pdfIn PDF document text
    • http://geleostone.online/kimus5opu7.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/gemupusotixa.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/ropepitorijel_lenof_vugovovuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_5fdd0c0e8b97e.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/0ac7dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keputeka.epizy.com/91076433479.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_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 5276 bytes
SHA-256: 38c611fedff5084c53cbd0d0bedd64f8ee530fae46f51845c835ce2111aa31ff
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10264 bytes
SHA-256: 7a224a20a79d7f34558edcdd668aefcc0d1f13d7081a07cb094d7ac6e528db50

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