Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23c78de9c5b0441…

MALICIOUS

PDF

33.6 KB Created: 2020-03-28 01:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3570a07a8811ee590526c16343d7bf92 SHA-1: fc6d6f7bdf26664ad9320f63e8004d8cfaeeca20 SHA-256: d23c78de9c5b044191d89d1bbdfdce2633d05d7c10f4e8ae9dfbaaa207e42daf
94 Risk Score

Malware Insights

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

The PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links, suggesting a link farm or redirection strategy. The ML_NYX_PDF_MALICIOUS model also flagged this PDF with high confidence. The embedded URLs, such as http://zambiasafarihunting.com/uploads/1/3/0/6/130639336/130639336.html#honeywell+rth2310b+thermostat, are likely part of this scheme. The document body contains garbled text and some of these URLs, reinforcing the link farm attack pattern.

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://zambiasafarihunting.com/uploads/1/3/0/6/130639336/130639336.html#honeywell+rth2310b+thermostat
    • http://onesimplyiris.com/uploads/1/3/0/6/130622005/nokekipalemine.pdf
    • http://holytrinitymillbrook.com/uploads/1/3/0/5/130588842/gosog.pdf
    • http://www.changingstep.com/uploads/1/3/0/8/130813395/1edc2ab.pdf
    • http://mindsetgallery.com/uploads/1/3/0/6/130639592/46179.pdf
    • http://mta-sts.thecinnamonowl.com/uploads/1/3/0/5/130543684/bakaxuzigimas_kivod_sapulivajar.pdf
    • http://www.canterburylodge1635.co.uk/uploads/1/3/0/6/130639563/midefifikisuj.pdf
    • http://topincomemakers.com/uploads/1/3/1/3/131398241/nexafejikolegolene.pdf
    • http://iaminclusive.com/uploads/1/3/0/4/130477009/xorefas.pdf
    • http://pawsomewalksayrshire.co.uk/uploads/1/3/0/6/130622051/e5fdde.pdf
    • http://baycure.org/uploads/1/3/0/6/130620871/89e9d908cb33e.pdf
    • http://tjmun.com/uploads/1/3/0/5/130588505/6636184.pdf
    • http://maddoxresources.com/uploads/1/3/0/5/130539449/bidodimivitu_nomafajegewax_zulorova_kosuma.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_off00005a8b.bin
ffade4fdc46d70346d1fa865c10602f58884cd5c1b14bcdcb28da0f09f600936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8B 8024 bytes

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