Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb30ef5d25879bcf…

MALICIOUS

PDF

35.4 KB Created: 2020-05-16 23:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ff85f53492e4e850c6d3615f8650d1 SHA-1: cbf22fa71101be26d564ed41f821d9bec85b7af7 SHA-256: cb30ef5d25879bcf7adbf509dcce383a4bda5bb2d5e2b639cedecb26bc8cebb4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body contains text related to charts and application details, but the primary malicious activity appears to be the mass linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://teshuvah.international/uploads/1/3/0/7/130775961/130775961.html#horizontal+bar+chart+android+example
    • http://get-me-ct.com/uploads/1/3/0/6/130639653/66198d45f354dbb.pdf
    • http://augustinecolebrook.com/uploads/1/3/0/5/130550712/d4449ffd2b5.pdf
    • http://devregs.com/uploads/1/3/0/6/130639386/4623113.pdf
    • http://houseofgutters395.com/uploads/1/3/0/5/130589366/1e421675952.pdf
    • http://scubieee.com/uploads/1/3/0/5/130589230/7f68f38c863.pdf
    • http://ewa-10.com/uploads/1/3/1/3/131380828/nunirafi_jogurepanovoluz_bekoga.pdf
    • http://mrsscharnhorst.com/uploads/1/3/0/7/130738949/d8309.pdf
    • http://belfastdrivered.com/uploads/1/3/1/8/131856547/5159e.pdf
    • http://carmonaframing.com/uploads/1/3/1/4/131483209/3115458.pdf
    • http://cbdproductsusa.org/uploads/1/3/0/7/130776132/lajobu.pdf
    • http://eastmemphistreeremoval.com/uploads/1/3/0/7/130775256/riwimuzovixuzeb_ladeka_mefuwaperesi_dasuve.pdf
    • http://chaskasiding.com/uploads/1/3/0/6/130639910/2399587.pdf
    • http://kennesawproperties.net/uploads/1/3/0/7/130776296/454cde4b.pdf
    • http://allzordon.com/uploads/1/3/0/6/130604529/313135.pdf
    • http://reenaoncanvas.gallery/uploads/1/3/0/7/130776511/a2f8ae.pdf
    • http://herbasalus.store/uploads/1/3/0/8/130873807/luvizuse.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_off00005ddf.bin
25df0c6108575fc9bf2d7725444d85779283f436345a69eb9cb5408c4f9c215c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDF 10580 bytes

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