Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e3e426a5157bcc…

MALICIOUS

PDF

56.7 KB Created: 2020-06-16 18:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 63c11f952e586b2de61df0aa982ea500 SHA-1: f553787cf3050c6a2bd27ea368c7b2789c751aa3 SHA-256: e7e3e426a5157bccc41277cc107fe40d89364c0f94c7dac8edad1f4f5d728121
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body text, though partially corrupted, includes the phrase "Study links answers 5th grade" and references wkhtmltopdf, suggesting a lure to educational content. The primary heuristic indicates a "PDF SEO Link Farm" which is a common technique for distributing malicious links or content. The embedded URLs are likely part of a link farm designed to redirect users to potentially malicious sites.

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://obgroup.co.nz/uploads/1/3/0/6/130621066/130621066.html#study+links+answers+5th+grade PDF link annotation
    • http://ag47silveronline.com/uploads/1/3/0/7/130739460/bagow.pdfIn PDF document text
    • http://link2evolve.com/uploads/1/3/0/6/130639950/7667974.pdfIn PDF document text
    • http://bizlift.co/uploads/1/3/0/4/130490115/ritasikes-vukikagoje.pdfIn PDF document text
    • http://prettygirldesigns.net/uploads/1/3/1/3/131380258/a489722b.pdfIn PDF document text
    • http://dreamlighttravel.com/uploads/1/3/0/6/130639802/d8bcb7b94c1.pdfIn PDF document text
    • http://9goubuli.com.sg/uploads/1/3/0/6/130639511/wekuwekoxojomimag.pdfIn PDF document text
    • http://asesoresdesegurosmanejar.com/uploads/1/3/1/4/131412858/tosowese-kuwisodejus-salamuvupem.pdfIn PDF document text
    • http://govacationsamui.com/uploads/1/3/0/6/130604369/e4ff4b23d.pdfIn PDF document text
    • http://rivendellgoldens.com/uploads/1/3/2/3/132302921/zoboj_gitetiporetekek_fomefotalik.pdfIn PDF document text
    • http://magnimarket.org/uploads/1/3/1/3/131398431/rewiputel.pdfIn PDF document text
    • http://learnexploreandplay.org/uploads/1/3/1/4/131455825/dalek.pdfIn PDF document text
    • http://living-twenty.com/uploads/1/3/0/3/130313319/4849509.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_off00009f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0A 5344 bytes
SHA-256: 24efcc169e6e4d15d7c5424af639f263343891074a4b5d2fdbaa7ab5c27a993f
font_01_sfnt_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 10956 bytes
SHA-256: 84408f5f7db67e4c55096b9b32a406a7506bccda7e0b44af72b14fef4352ad46

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