Malicious PDF — malware analysis report

Static analysis result for SHA-256 d911b028bde523a8…

MALICIOUS

PDF

46.0 KB Created: 2020-06-17 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 4862561bbcce24511db66845f33bfec6 SHA-1: f73baba66b2f0179a2bc8ba89ce9f30a0e354174 SHA-256: d911b028bde523a8b1c313553146f620b8d3de1f4af464748b9a6a544861fb78
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 heavily obfuscated but appears to contain references to these links. The primary intent seems to be directing users to a network of websites, likely for SEO spam or to host further malicious content. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fourcornerstribalbusinesscorporation.com/uploads/1/3/0/4/130475938/130475938.html#sound+absorbers+pdf PDF link annotation
    • http://hypothequevalleyfield.com/uploads/1/3/0/5/130588611/jitaniredurix.pdfIn PDF document text
    • http://buttercupwool.co.uk/uploads/1/3/0/6/130639802/wozopi.pdfIn PDF document text
    • http://webmail.christianhollowfarm.com/uploads/1/3/0/6/130621467/a9bbd31ea.pdfIn PDF document text
    • http://linden58.pleasingfood.com/uploads/1/3/0/7/130775031/7443240.pdfIn PDF document text
    • http://mdfitnessconsulting.com/uploads/1/3/0/7/130740193/1470970.pdfIn PDF document text
    • http://bestcleanmakeup.com/uploads/1/3/0/6/130621979/xaxesezovaxoxav_tokibedo_pavizokojazi.pdfIn PDF document text
    • http://academievoorhetleven.nl/uploads/1/3/0/7/130775379/9875615.pdfIn PDF document text
    • http://webmail.oto-saigon.com/uploads/1/3/0/4/130436288/bizadosu.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 6

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_off00007872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7872 5000 bytes
SHA-256: 6e1579a4a5ea116f7b02a8fd3b20d3c46e274db74d948ba849595bdc9cc56ad4
font_01_sfnt_off0000895d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895D 10264 bytes
SHA-256: f71a9ce1353c3624b9d55ca8d48bc5f5db448948bddef7bf7fff0fc9511a1f16

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