Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dc32e46c05152b…

MALICIOUS

PDF

40.5 KB Created: 2020-03-28 10:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4710d50d4726b95fc9c1d9869f00683 SHA-1: dc349c6ecd5776a6c937a604923e6d634a2e5042 SHA-256: c3dc32e46c05152b47d1b1faeaa43c314df27fc128a4048f8e3a652ec0bab278
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, many of which point to similarly structured URLs on different domains. The document body, though partially obfuscated, contains text related to glucose conversion and references the wkhtmltopdf tool, suggesting a lure to a fake conversion or information page. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic indicates a pattern of generating numerous links to potentially malicious content.

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://bshppopup.com/uploads/1/3/0/6/130639283/130639283.html#convert+a1c+to+estimated+average+glucose
    • http://feedingforjesus.com/uploads/1/3/0/6/130620283/5fe9c78d4.pdf
    • http://slouchfix.com/uploads/1/3/0/6/130621164/98ffe.pdf
    • http://cateringgenova.com/uploads/1/3/0/7/130740441/dibefefiguxov.pdf
    • http://hemspase.com/uploads/1/3/0/3/130313585/terana.pdf
    • http://repsaved.ca/uploads/1/3/0/6/130639583/duxax-ximat-nafogizisujego.pdf
    • http://onexeveryone.com/uploads/1/3/0/5/130539697/741091.pdf
    • http://israeling.net/uploads/1/3/0/2/130270748/gofabofutexa.pdf
    • http://mentor.wonderschool.com/uploads/1/3/0/3/130323581/xirugivixosite.pdf
    • http://greenmachinemobile.com/uploads/1/3/0/3/130379612/e46132a96fa0cf3.pdf
    • http://newyorkrealestate.solutions/uploads/1/3/1/3/131382693/641088.pdf
    • http://steamandspirits.com/uploads/1/3/0/5/130539129/f361d7b6.pdf
    • http://theivylaneblog.com/uploads/1/3/0/6/130605416/jotiw-tomev.pdf
    • http://thebrowhaus.com/uploads/1/3/0/7/130738824/8566460.pdf
    • http://merkabaone.com/uploads/1/3/0/2/130287866/4108458.pdf
    • http://nowaysir.com/uploads/1/3/0/5/130551162/zudilugel_kobozif.pdf
    • http://makeartsforabetterlife.org/uploads/1/3/0/5/130541552/7552637.pdf
    • http://ttslighting.com/uploads/1/3/0/6/130620644/bovonaradapexejikilu.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_off00007382.bin
d9bc665fa55db422d16120bf9f8f405892f5559aa8cf75f74f8512fb8ebbca15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 8220 bytes

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