Malicious PDF — malware analysis report

Static analysis result for SHA-256 21281f5244f25d59…

MALICIOUS

PDF

40.6 KB Created: 2020-03-30 05:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea73ed386ce1272ffad324972cbbc4b9 SHA-1: 489267e03877ddfe842d744408200de3f0985e2c SHA-256: 21281f5244f25d59787403d599f3f64d7b0074fc2d7de2179353282bb8215d37
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a common tactic for SEO spam or link farms. The document body, though partially corrupted, includes a title related to plant growth regulators and references the wkhtmltopdf tool, suggesting a lure to redirect users to potentially malicious or unwanted content. The ML classifier strongly flagged this PDF as malicious.

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://northernrailleaders.com/uploads/1/3/0/9/130969373/130969373.html#reguladores+del+crecimiento+vegetal+pdf
    • http://deerwoodgroup.com/uploads/1/3/0/6/130605222/ad6ced6.pdf
    • http://best-sil.com/uploads/1/3/0/4/130483772/soxenepe_ruwuzut_satuxefuvesa.pdf
    • http://kaitumokykla.lt/uploads/1/3/1/3/131379248/zuxubej.pdf
    • http://whiterocksouthsurreydoula.com/uploads/1/3/0/8/130813524/kiwurikuzikagekonafa.pdf
    • http://lymetimeja.fun/uploads/1/3/1/0/131070880/pixebinale.pdf
    • http://moursyelectricservice.com/uploads/1/3/1/3/131384156/xuxumo-viguju-lusupavot-legabolun.pdf
    • http://singingstrings.net/uploads/1/3/0/2/130271030/bowol.pdf
    • http://creamridgeswim.com/uploads/1/3/0/6/130603919/niwetivafigi.pdf
    • http://sanityhomesolutions.com/uploads/1/3/0/5/130590224/2179309.pdf
    • http://www.ixylabs.com/uploads/1/3/0/6/130604013/xufadidevopafib.pdf
    • http://physioconcepts.com.au/uploads/1/3/0/6/130604630/vidanezokux.pdf
    • http://proedge406.com/uploads/1/3/0/4/130435574/bekefug_religuvuradoziv_fedukozejuna.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007781.bin
df32287dd25a92215980c580b52a2761ddc8c2818fdc683d54692a65432a2817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7781 8176 bytes

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