Malicious PDF — malware analysis report

Static analysis result for SHA-256 4043fd7372acb6d3…

MALICIOUS

PDF

40.0 KB Created: 2020-06-18 23:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279300e45568f6d41667bbebdd8dc27a SHA-1: 2577be7570f0763a9c88b68c9b1edd1b5ea0eef3 SHA-256: 4043fd7372acb6d31d540b2e06f4036e7d5cc9994804dc496e7542e3912eec54
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF documents hosted on various domains, indicative of a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to the URLs and the topic 'Balance de cargas electricas trifasicas pdf', suggesting a lure to generate traffic or distribute further content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://championsforchoice.com/uploads/1/3/0/5/130589310/130589310.html#balance+de+cargas+electricas+trifasicas+pdf
    • http://abcrmc.net/uploads/1/3/0/6/130620565/gadaluruvirilugomul.pdf
    • http://houstonbusinessvoiprates.com/uploads/1/3/1/0/131070481/1448416.pdf
    • http://fenceproofthecarolina.com/uploads/1/3/0/3/130323384/2247330.pdf
    • http://parents.sprigeo.com/uploads/1/3/1/3/131379824/9763717.pdf
    • http://mlhconsultancy.com/uploads/1/3/0/5/130542717/925879.pdf
    • http://danilopuccetti.com/uploads/1/3/1/1/131164266/vowidu.pdf
    • http://larsonreversemortgageteam.com/uploads/1/3/0/4/130488445/23b34c4199ab.pdf
    • http://tsotbonline.com/uploads/1/3/2/6/132682919/nafibogad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bdc.bin
68b7c53a9431c71a63cb7a56a7b09953cdf4008cf9cf04e8ce50c7cc00a0202f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDC 5052 bytes
font_01_sfnt_off00006d09.bin
6b3c950410e22a869e31524863076f8862558934585f66ec67368d44d4a1e913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D09 11220 bytes

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