Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47fb1fd51a8f83d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-12 08:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ccd607de3156ad363eed5ffc61487eb SHA-1: 6c30216eedcc69a9e867c7a6213dbe7415268215 SHA-256: a47fb1fd51a8f83d8c738ab6b8a8213e94961a9f0fda741732e776d30c492d0d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, likely intended to manipulate search engine rankings or direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/award?keyword=top+business+management+books+pdf PDF link annotation
    • https://cdn.sqhk.co/nitumatemi/kgf1bZT/98493189075.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/3216318.pdfIn PDF document text
    • https://lubavezutumeji.weebly.com/uploads/1/3/4/7/134757539/legexudomasolutofop.pdfIn PDF document text
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/f730dd294edaf.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/2934456.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/Cghhaja/21465206299.pdfIn PDF document text
    • http://cmb-accueil.com/tutitiloveritekukurpjivt.pdfIn PDF document text
    • https://lazarapo.weebly.com/uploads/1/3/4/5/134528324/pujidaxu.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/worksheets_on_active_and_passive_voice_for_class_6.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/vixewakokimexogaw.pdfIn PDF document text
    • http://scrlt.xyz/777519884ds2rb.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/paturakabusiwure.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/fifutoruza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_3f3c3d39553e4d0d95da3bbf8bd84f94.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/28523435589.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_6748b1d211174b84b22afac70cf127ad.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_59ee247ff165469f95d9a6a5821f8d99.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_2934963cbad94a6c8f9fcda00d90db56.pdf?index=trueIn 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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5384 bytes
SHA-256: f4cc0572a8195cd51a37b7605bb04ae5c24f15174c29d4f61a81440401d49620
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 10104 bytes
SHA-256: 9d7334fa73d0e55aadd3864c2fa2d0ae286b6347983930d92247bf39bbd09575

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