Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc68b7b2696910c3…

MALICIOUS

PDF

53.1 KB Created: 2020-03-25 14:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25209050524099d54e843461e6965961 SHA-1: 39db65b7fa1d6331c311ff10d0c0b73741f66708 SHA-256: bc68b7b2696910c3437b6c0f48d795adef65aef5aafd90f9f80f3cebdf911d82
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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports this assessment.

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://gracecartercapstone.com/uploads/1/3/0/7/130776257/130776257.html#raiz+cuadrada+de+exponente+6
    • http://slime2go.org/uploads/1/3/0/8/130814247/dcc5c600d036371.pdf
    • http://www.michaudtyler.com/uploads/1/3/0/6/130604161/2428d8e90542.pdf
    • http://meetthenolans.com/uploads/1/3/0/4/130489536/2d9e17f426.pdf
    • http://goldheartpersians.com/uploads/1/3/0/2/130287514/4022553.pdf
    • http://bethelmoms33.com/uploads/1/3/0/7/130775200/lafis-wowoz-lolenazemilesup-fidifojimipege.pdf
    • http://webmail.karriemichelle.com/uploads/1/3/0/8/130814056/woxesoge_xitepupe_vanipes_tiwefusumo.pdf
    • http://cleaneatingpro.com/uploads/1/3/0/6/130620184/rugotawipemefov.pdf
    • http://disabilityresearch.org/uploads/1/3/0/8/130874039/fapuravopofedadugux.pdf
    • http://newplumtreeheights.com/uploads/1/3/0/5/130539249/3ad6a6a.pdf
    • http://picketfencerestaurant.com/uploads/1/3/0/4/130476491/564350.pdf
    • http://boutiqueethereal.com/uploads/1/3/0/2/130291809/8315497.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008173.bin
5aa487fd2ce7150fe34c61aee35044b107b349efbd674e9075971d233a0e6a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8173 10964 bytes
font_01_sfnt_off0000a838.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA838 2652 bytes
font_02_sfnt_off0000b1a1.bin
4a1418c1766de085c735474171fe331b2d608b4809629588e8e102dba14e33ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 16100 bytes

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