Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8b430b8f41d2e7…

MALICIOUS

PDF

45.4 KB Created: 2020-04-15 02:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4f7b41a6426482fadaba9c31ef801141 SHA-1: 920a5dec2ba0e16d9a7fb2d14d48fec412cdc8d9 SHA-256: 5f8b430b8f41d2e75bb8d628bfc5969f4c48ae1d844c3eab455f33f3092e2118
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external links, suggesting a link farm or redirection scheme. The document body contains garbled text and a URL that appears to be related to medication side effects, potentially a lure.

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://roadshowarchitects.com/uploads/1/3/1/6/131606668/131606668.html#metformin+xr+500mg+side+effects
    • http://fordbyrdconsulting.com/uploads/1/3/0/7/130775258/tefekud.pdf
    • http://pamswaycreations.com/uploads/1/3/0/4/130488811/furoturagonu-bilalowopa.pdf
    • http://ogradycommunications.com/uploads/1/3/1/4/131406797/3737960d631b.pdf
    • http://streetdancenow.com/uploads/1/3/0/5/130588388/7359169.pdf
    • http://belredsportschiropractic.com/uploads/1/3/0/3/130379363/f5d7464d5.pdf
    • http://observafoto.org/uploads/1/3/0/6/130605044/6022708.pdf
    • http://theadventure.company/uploads/1/3/0/6/130605517/movofuxuf.pdf
    • http://lukaslife.com/uploads/1/3/1/4/131453283/8704244.pdf
    • http://everhartcollectorsgroup.com/uploads/1/3/0/4/130478520/kojusixupave_wosiwebulowe_sapumivuzonuti.pdf
    • http://thenaturalorderstore.org/uploads/1/3/0/3/130323620/6694a7.pdf
    • http://karibuinteriordesign.com/uploads/1/3/0/8/130874457/lidalubuj.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_off00008ca8.bin
77963c53254da857d34edfca882bba1306fd6e10a8ce43dd24796f500aab5a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA8 7380 bytes

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