Malicious PDF — malware analysis report

Static analysis result for SHA-256 706e2cfbb8f87435…

MALICIOUS

PDF

42.5 KB Created: 2020-06-04 19:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2acf9008fcd1748d681029352914d2 SHA-1: c8439da7919b6c9ea463c56c354456b0b3c946b7 SHA-256: 706e2cfbb8f87435f577b8aef5767b69ccc27f4ff40d80698cbca0824b134a1f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded URLs point to various domains, suggesting a link farm or a method to distribute potentially malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence indicate a malicious intent, likely related to SEO spam or phishing lures.

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://countrykidschildcare.net/uploads/1/3/1/6/131637308/131637308.html#maximiliano+de+habsburgo+pdf
    • http://algomaci.org/uploads/1/3/1/0/131070362/vodamudela_woxajuxetigo.pdf
    • http://kimmydee.com/uploads/1/3/0/7/130776775/wizij_tarizupu.pdf
    • http://maappn.org/uploads/1/3/0/9/130969748/gapogotuv.pdf
    • http://irkvalley.org/uploads/1/3/0/8/130814284/gapiwunijotabiliwun.pdf
    • http://minneapolisinteriorpaintpros.com/uploads/1/3/1/3/131381799/pejawoxa-difonofesasexab-gisujanazam-dikoki.pdf
    • http://sligergames.com/uploads/1/3/0/5/130588754/rexujevu.pdf
    • http://kellykirkpatrickmft.com/uploads/1/3/0/8/130874580/2646651.pdf
    • http://loteteacher.com/uploads/1/3/1/6/131637686/vawarupixufusezixulo.pdf
    • http://yazminscafe.com/uploads/1/3/1/6/131636914/684984.pdf
    • http://escapeblueridge.com/uploads/1/3/0/4/130476650/d379aa49c3.pdf
    • http://quikwatch.net/uploads/1/3/0/6/130621789/4747011.pdf
    • http://lyndoncarriger.com/uploads/1/3/0/6/130639273/megizowujimulugumuko.pdf
    • http://centralcoastshows.com/uploads/1/3/1/4/131438835/7571765.pdf
    • http://countrykidschildcare.net/uploads/1/3/1/6/131637308/terms.html
    • http://countrykidschildcare.net/uploads/1/3/1/6/131637308/dmca.html
    • http://countrykidschildcare.net/uploads/1/3/1/6/131637308/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zubugoko.files.wordpress.com/2020/06/65696386274.pdf
    • https://tetajis.files.wordpress.com/2020/06/27420711605.pdf
    • https://dokazadi.files.wordpress.com/2020/06/49834048818.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007921.bin
5dce748430c8cbf895732d42804c6c636030176760c487e4a4179fbbeda05336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 10920 bytes

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