Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d678e4fdfa0d12…

MALICIOUS

PDF

38.8 KB Created: 2020-06-04 15:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 96982001194ef22e1a85b64124ed4048 SHA-1: d0c9212e5f58a0865850b58f0a735b2d29d5576c SHA-256: b8d678e4fdfa0d123be5d1b416fa16df6a6ed0e5f0d776683438f9a3bb2305fc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body is largely unreadable binary data, but the presence of numerous links to PDF files on various domains suggests a link farm or redirection scheme. The primary IOC is the initial URL found in the document, which leads to a similar structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://bytecubed.io/uploads/1/3/0/9/130969656/130969656.html#exemple+fiche+c54+bts+muc PDF link annotation
    • http://biofieldtherapy.net/uploads/1/3/0/5/130589339/bb338723424a5a5.pdfIn PDF document text
    • http://opbp.org/uploads/1/3/0/2/130272477/komapaxagobemire.pdfIn PDF document text
    • http://themainsourcemedia.com/uploads/1/3/0/6/130604877/kozopuvatu.pdfIn PDF document text
    • http://lldenc.com/uploads/1/3/1/3/131381540/labaxuwatixap.pdfIn PDF document text
    • http://chesslerlab.org/uploads/1/3/0/6/130621143/3750653.pdfIn PDF document text
    • http://jonesborosp.com/uploads/1/3/1/4/131406356/tubiruxojevuposix.pdfIn PDF document text
    • http://broadwayinsurancenc.com/uploads/1/3/0/5/130590582/jusizufevujuba-jatifemepir-tapow.pdfIn PDF document text
    • http://3r3.undesirable.us/uploads/1/3/0/2/130272862/51e4a.pdfIn PDF document text
    • http://3gj.undesirable.us/uploads/1/3/1/6/131606140/seraliwunijaf.pdfIn PDF document text
    • http://intothe4thdimension.com/uploads/1/3/1/6/131608017/xenova.pdfIn PDF document text
    • http://vinthreads.com/uploads/1/3/1/6/131636664/bomimilubujoxef.pdfIn PDF document text
    • http://mail.cdaci.ca/uploads/1/3/1/3/131384044/93e30f10c266.pdfIn PDF document text
    • http://webdisk.sjsbp.org/uploads/1/3/1/4/131453980/190217.pdfIn PDF document text
    • http://bytecubed.io/uploads/1/3/0/9/130969656/terms.htmlIn PDF document text
    • http://bytecubed.io/uploads/1/3/0/9/130969656/dmca.htmlIn PDF document text
    • http://bytecubed.io/uploads/1/3/0/9/130969656/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lirusiwebofe.files.wordpress.com/2020/06/gonowuxasavexivesowig.pdfIn PDF document text
    • https://puwerubeguro.files.wordpress.com/2020/06/40790249172.pdfIn PDF document text
    • https://dikajawu.files.wordpress.com/2020/06/80070162735.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

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 13476 bytes
SHA-256: 9b686538db347b818cb0b64ff9da6e65a1e52fe5a3bc74851f35d417da613625

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