Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4181ce7ea0f4396…

MALICIOUS

PDF

37.2 KB Created: 2020-04-13 15:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df5d9149c810fbf4905e0bc99d4f0d4d SHA-1: d8bfb762b001b8a1597a60f334fea66c61d50197 SHA-256: c4181ce7ea0f4396034215d58e1155efec9cb2b39919d11c718569b448214441
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body contains a generic thank you message and a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm or SEO poisoning tactic to distribute malicious content.

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://lambsontherapy.com/uploads/1/3/1/4/131406895/131406895.html#thank+you+in+advance+for+your+cooperation+on+this+matter
    • http://integratededucationalconsulting.ca/uploads/1/3/0/7/130775747/bowisazudofunej_rawemilajeliv_miposajefi.pdf
    • http://boxesandblessings.org/uploads/1/3/1/4/131454049/zonupebu_wuvuganiruko_megep_vovewiwu.pdf
    • http://muziekcursusonline.com/uploads/1/3/1/4/131454537/zexurafesilaxasu.pdf
    • http://oneflamingo.com/uploads/1/3/0/7/130739789/wurox_nisobofivojesak.pdf
    • http://vintageshizzle.com/uploads/1/3/0/6/130604230/4b07dbdd78c7.pdf
    • http://franklinmudhens.com/uploads/1/3/0/6/130620371/menozep-mefalejija.pdf
    • http://guildmerch.com/uploads/1/3/0/7/130740432/f7387c.pdf
    • http://sousaband.com/uploads/1/3/1/4/131483219/dozitokagufamot-radutapewi-bedurud.pdf
    • http://mksports.ie/uploads/1/3/1/4/131453096/tijabiputazaso.pdf
    • http://mksports.ie/
    • 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_off00006857.bin
10cb85afb0aa2ba94774f463fcde57d2735c6dd57dda6d2c492199c5faf1c8bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6857 7700 bytes

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