Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8733d24bd5969d9…

MALICIOUS

PDF

67.9 KB Created: 2020-06-22 09:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 01acc3cb3571db6f7bba8c75d80c2435 SHA-1: 9804c8ddc0cb761923652e12424a4b0fccc5312b SHA-256: e8733d24bd5969d9fbd869b96187bfc9f2c15049df2defe769cf448d384cdf2c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body and extracted URLs suggest a link farm designed to drive traffic to various domains, likely for malicious purposes. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://megantuckernationalcertification.com/uploads/1/3/0/6/130621084/130621084.html#guide+book+writer PDF link annotation
    • http://brunson-insurance.com/uploads/1/3/1/3/131398336/dumozexafum.pdfIn PDF document text
    • http://bellebaeuk.com/uploads/1/3/0/5/130550903/dewaluga_totodosiro.pdfIn PDF document text
    • http://hometravel.org/uploads/1/3/0/9/130969525/kiluluwanikel.pdfIn PDF document text
    • http://garynolan.ca/uploads/1/3/0/5/130588497/b95b8400cb30e19.pdfIn PDF document text
    • http://cpanel.cabincreekfarmstudio.com/uploads/1/3/1/0/131070566/gadorusupomob_vebate_janejati.pdfIn PDF document text
    • http://team5dm.com/uploads/1/3/0/4/130477131/7604448.pdfIn PDF document text
    • http://mrmartinez.info/uploads/1/3/0/6/130621648/748697.pdfIn PDF document text
    • http://gleamla.org/uploads/1/3/0/4/130435706/57b01817a599.pdfIn PDF document text
    • http://mx.ecjc.net/uploads/1/3/1/4/131482882/xabitezimaj.pdfIn PDF document text
    • http://jlgaproperties.com/uploads/1/3/0/7/130775755/wijavopivubafej.pdfIn PDF document text
    • http://cmanmedia.com/uploads/1/3/0/8/130873902/xobubogelu_sifujejipuruxa_mitajuni_tajedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 4500 bytes
SHA-256: 00776971e848a8ce614ac83c4d2038d256422a56302f09487b93e2b1ba289e40
font_01_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 11372 bytes
SHA-256: 8fc81d24a86e681186b9039b7553d132d64f8c1f1779e53f3335005863b4203f

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