Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2999ee123da301c…

MALICIOUS

PDF

40.6 KB Created: 2020-04-07 13:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ebaff587f594677314d86514be312b62 SHA-1: d2e6f431c115ee99eb74b7ca2f2fc7687ce5ce26 SHA-256: c2999ee123da301c391454a8eb673f669a7226207c9c42f5f99e953ab6e322b4
96 Risk Score

Malware Insights

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

The PDF 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 confirms the suspicious nature of the embedded URLs. The document body itself appears to be a garbled mix of metadata and URL fragments, further suggesting it's not intended for legitimate user consumption.

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://aquaenergyllc.com/uploads/1/3/1/3/131379406/131379406.html#kenmore+90+series+dryer+troubleshooting+no+heat
    • http://www.janibotanicals.com/uploads/1/3/0/6/130604406/1857811.pdf
    • http://nuwavelocs.com/uploads/1/3/0/7/130739221/d6f5a.pdf
    • http://global364.com/uploads/1/3/1/4/131454580/bogixotixugaripi.pdf
    • http://newhorizonsinc.net/uploads/1/3/1/3/131384636/e6d06ba123.pdf
    • http://rachelmascord.com/uploads/1/3/0/5/130589309/jizegosedowan.pdf
    • http://jabujewelry.com/uploads/1/3/1/1/131164205/zopupoko.pdf
    • http://lao-lu-fang.com/uploads/1/3/0/9/130969169/senolujer_lanafibiwubig_muzuromin.pdf
    • http://vancitypiano.ca/uploads/1/3/0/7/130738525/3038303.pdf
    • http://benjadrink.com/uploads/1/3/0/6/130621460/rupisuwinodugo_kujisofide.pdf
    • http://openairadventurecare.com/uploads/1/3/0/6/130639541/ruzagojuga-lugasevisuw-muzotusovopiba.pdf
    • http://thinkepi.com/uploads/1/3/0/5/130590578/b960474585b7176.pdf
    • http://merchsyte.com/uploads/1/3/0/7/130775404/6034991.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a9e.bin
b54d951a01ff21857da64f0556f9592274e16fbfd8a09e311fe9c0b1b09cc035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9E 7988 bytes
font_01_sfnt_off000089b9.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B9 2616 bytes

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