Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2ca74be0e15101…

MALICIOUS

PDF

34.4 KB Created: 2020-05-19 11:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db98bd456d95fd3c55e9937c687bba68 SHA-1: 4c70d5e2e43934822fba5a469c24398f82ba4e0b SHA-256: 5b2ca74be0e15101cde74f57f35ff7c98ee7ee44003a2ccc8f67be9dea0ea7cd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, identified as a 'PDF SEO Link Farm'. The embedded document body text, though partially corrupted, includes a URL that points to an HTML file, suggesting a potential redirection or lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://tripanmarketing.com/uploads/1/3/0/4/130483540/130483540.html#the+great+kapok+tree+comprehension+questions
    • http://melisamarquezrodriguez.com/uploads/1/3/1/3/131381819/c9f18c5b412.pdf
    • http://blueridgechildrensmuseum.com/uploads/1/3/1/4/131407647/doluzitoke.pdf
    • http://wanderus.com/uploads/1/3/1/4/131454537/38e245d.pdf
    • http://raregloonthego.com/uploads/1/3/0/2/130272415/sazejebibuvigevanef.pdf
    • http://ashleymcmahon.com/uploads/1/3/0/6/130640227/1258435.pdf
    • http://durrana.com/uploads/1/3/0/2/130272428/fegenob_gidapalov_vemijo.pdf
    • http://allegiance251.com/uploads/1/3/0/6/130620370/1740242.pdf
    • http://paparentadvocates.com/uploads/1/3/0/6/130605435/352217.pdf
    • http://newfiebullet.net/uploads/1/3/0/5/130588659/mimosufisimemi_sosematizobi.pdf
    • http://causalculture.com/uploads/1/3/1/6/131606640/jipofojeni-mojus-wirilurel-nudinebadegu.pdf
    • http://stylebyquilo.com/uploads/1/3/0/8/130814078/nugobij.pdf
    • http://blackoakfamilyfarm.com/uploads/1/3/1/8/131856214/0639e7b55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005ccb.bin
521a3ca9763b33d8a085e8b704a29fc375cb59acc1615f110bb269cd0973b4e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCB 9872 bytes

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