Malicious PDF — malware analysis report

Static analysis result for SHA-256 be942c116d867881…

MALICIOUS

PDF

35.6 KB Created: 2020-03-29 06:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34bd2dcb191bbf3eca8f660f21b7f472 SHA-1: ed6989da5a4301118314f6e6f78ee7e59f6bdd9a SHA-256: be942c116d867881b9c4830c16fe882cc3683d49e995a3a1024ae8da05f53659
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This is indicative of a link farm or SEO poisoning attack, designed to drive traffic to these external resources. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily corrupted, making it difficult to ascertain the exact lure.

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://www.grupoleyan.com/uploads/1/3/0/5/130543437/130543437.html#conversi%C3%B3n+de+unidades+dm3+a+l
    • http://saveourbcfisheries.com/uploads/1/3/0/5/130542972/rasomotomajexuduw.pdf
    • http://ldscraft.com/uploads/1/3/0/5/130551764/3861287.pdf
    • http://tn2m.ca/uploads/1/3/0/6/130621321/295364.pdf
    • http://allservicepanda.com/uploads/1/3/0/5/130544132/6a972ef03c.pdf
    • http://campconcordia.net/uploads/1/3/0/4/130483125/d4a56ba5.pdf
    • http://go.hopeforesthills.com/uploads/1/3/0/2/130291575/5936bc382b78b2.pdf
    • http://www.stitchthis.net/uploads/1/3/0/5/130539735/kenoza-femulirazaxej-kirikebid.pdf
    • http://thehappytartdelray.com/uploads/1/3/0/5/130541624/kedatisab-furosomuner.pdf
    • http://www.thereclinershop.com/uploads/1/3/0/3/130323120/d671b87812320f.pdf
    • http://www.burnoutfestival.be/uploads/1/3/0/5/130547340/vusiwukat.pdf
    • http://banriapharma.com/uploads/1/3/0/7/130775929/zirilelaloxog.pdf
    • http://kayleenelson.com/uploads/1/3/0/6/130620564/jonarowatemapi.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_off000061bc.bin
c33c4268c7f62aedbf9dd44f7491b59c8265ca71549548f76ea192017bc426f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 8056 bytes

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