Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee443b61ed9b1cff…

MALICIOUS

PDF

30.0 KB Created: 2020-04-01 18:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da4af24d14e4ce0d6c5ced6d9edc85a4 SHA-1: e9fb114921ae3910234a7e395d695e1216eb7314 SHA-256: ee443b61ed9b1cff3f3e23cdd66fcf97d11a9f81d88602e8cb883b8cc644c5cf
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated but appears to contain references to the linked URLs, suggesting a link farm or redirection scheme. The primary intent appears to be directing users to a network of potentially malicious websites.

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://paperheartsandmore.com/uploads/1/3/1/4/131408567/131408567.html#ib+sl+maths+data+booklet
    • http://dsjnlee.com/uploads/1/3/0/5/130589131/8794693.pdf
    • http://mespinozamen.com/uploads/1/3/0/6/130621781/3bb1da4f369.pdf
    • http://merz-verlag-en.com/uploads/1/3/0/9/130969313/kuvof_nexeb.pdf
    • http://vikingband.org/uploads/1/3/0/4/130483158/sururuxam-fagaganita-nivokijulu-tidulagomu.pdf
    • http://shesaknockout.com/uploads/1/3/0/5/130551441/tinorakivibonas.pdf
    • http://shapnas.com/uploads/1/3/0/7/130739720/05d86d26a984.pdf
    • http://elitemineralsinc.com/uploads/1/3/0/3/130324234/lefuzo_jirimisugofixij.pdf
    • http://mainecommunitybuilders.com/uploads/1/3/0/2/130289296/texabo-geketasezuji-zepiveno.pdf
    • http://mynutritionandwellnesscoach.com/uploads/1/3/0/7/130776221/xuvevaxago.pdf
    • http://hubpainters.net/uploads/1/3/0/4/130490687/789852.pdf
    • http://arth.services/uploads/1/3/0/6/130603709/9920935.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_off00004ee1.bin
95f03359e03ee890683d99860079657fe643e69bceb62761f448020281980c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE1 7284 bytes

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