Malicious PDF — malware analysis report

Static analysis result for SHA-256 28becaabf2d3f7a5…

MALICIOUS

PDF

39.7 KB Created: 2020-03-21 17:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 146dcf539cdc5bdf79620bf51d796469 SHA-1: c01efdcbf9e637c53c76b8f4e5e76ac2ce600109 SHA-256: 28becaabf2d3f7a5f3b3d85d422991ec7d6c8bd5acf3b9efd1127cb07d38a77d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that points to a similar structure of nested directories and numeric filenames, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern appears to be directing users to a multitude of external resources.

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://justincdavismusic.com/uploads/1/3/0/8/130814343/130814343.html#casos+de+maltrato+animal+en+puerto+rico
    • http://xxlleague.com/uploads/1/3/0/4/130483266/757385.pdf
    • http://lusciouspussy.com/uploads/1/3/0/5/130540824/10cb50.pdf
    • http://mrscastilloperez.com/uploads/1/3/0/2/130291485/01eb22edc37263.pdf
    • http://carolynkforonda.com/uploads/1/3/0/6/130604729/29a28263defd2f.pdf
    • http://mifamilialawncare.com/uploads/1/3/0/3/130323162/gatasikarizo-rawutarunirosi-fimafunov.pdf
    • http://supersealusa.com/uploads/1/3/0/6/130605482/mosaxef-xewewigiru-fupinamomu.pdf
    • http://dmdonline.info/uploads/1/3/0/6/130639081/4092534.pdf
    • http://www.crearchi.be/uploads/1/3/0/5/130540725/sozox.pdf
    • http://www.sugarfoxonline.com/uploads/1/3/0/5/130550756/3e5c3082d4f1d5.pdf
    • http://christiancitizensunited.com/uploads/1/3/0/7/130739503/dotubufugidojejed.pdf
    • http://brbcdcanda.org/uploads/1/3/0/5/130540583/9307733.pdf
    • http://www.soulfuelcoaching.com/uploads/1/3/0/5/130542822/wixulomifutawobipipe.pdf
    • http://baptisteworks.com/uploads/1/3/0/5/130540286/52f2382a.pdf
    • http://pbgvillage.com/uploads/1/3/0/3/130379319/e8246.pdf
    • http://atchisonair.com/uploads/1/3/0/7/130776221/ruziper.pdf
    • http://hostmaster.wstcharity.com/uploads/1/3/0/7/130776367/ganupodaj-buguw-towita.pdf
    • http://cretanoliveoilfarm.gr/uploads/1/3/0/8/130874388/7257232.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_off00006ff4.bin
5c1717e8238b5b8caa695a1038585c71bc42bb2029d5840476b00e140338173f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF4 8712 bytes

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