Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3201040a4f8d9d…

MALICIOUS

PDF

49.7 KB Created: 2020-03-22 06:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07de1082d4d0e6d7f4930804ccd0d241 SHA-1: c24f5d3f80abc2147ca0eb255f8aa4eea4d40ab1 SHA-256: 7c3201040a4f8d9da0e1f0d67bf5f6262f728ae28b30f386e9146b669956c1b6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files hosted on unrelated domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body text is garbled, but the presence of numerous external URLs suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://secondmarshmallowbook.com/uploads/1/3/0/7/130738621/130738621.html#texto+informativo+sobre+animais+de+estima%C3%A7%C3%A3o
    • http://www.mkayinthemountains.com/uploads/1/3/0/5/130550874/fajewo_vudole.pdf
    • http://optoutattorneys.com/uploads/1/3/0/7/130776529/9774604.pdf
    • http://lvgbc.net/uploads/1/3/0/6/130621123/lururuzodumupi-lexowobupo.pdf
    • http://lincolnbraselart.com/uploads/1/3/0/5/130589123/9226578.pdf
    • http://alt-davos.club/uploads/1/3/0/3/130379517/189cf9482aef58f.pdf
    • http://stern-line.com/uploads/1/3/0/4/130479312/8721317.pdf
    • http://exteriorcontractor.co/uploads/1/3/0/2/130272443/2f2935a0d83b.pdf
    • http://theboujeemom.com/uploads/1/3/0/6/130639233/zaxuto_bafigog_mumekinusurizi_novuvuzosexuk.pdf
    • http://bookkeepingandbusinessconsulting.com/uploads/1/3/0/3/130379353/edd02b4.pdf
    • http://aesthetiderm.com/uploads/1/3/0/2/130287257/2589659.pdf
    • http://www.peequality.com/uploads/1/3/0/7/130776805/8781a9b0b5.pdf
    • http://portertransportation.org/uploads/1/3/0/3/130379049/moveraxipavux_nipiduroso.pdf
    • http://wanderous.us/uploads/1/3/0/6/130621429/fozawuruti.pdf
    • http://lovefoundationproject.com/uploads/1/3/0/2/130288534/9854074.pdf
    • http://artbyjulieh.com/uploads/1/3/0/3/130323167/jewag-lominomi-xerakeg.pdf
    • http://thebritishhotel.net/uploads/1/3/0/7/130740141/jomuzesirezud.pdf
    • http://imperiumlegalnurse.com/uploads/1/3/0/8/130814393/pawepomevuxalivokoz.pdf
    • http://smallbeginningsfamilyfarm.com/uploads/1/3/0/9/130969992/1648621.pdf
    • http://world-store-line.site/uploads/1/3/0/7/130738620/2061413.pdf
    • http://tessbellomo.com/uploads/1/3/0/5/130589287/gadakutanibaf.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_off00009272.bin
1b8273a9243efde690dd7cd2968d39c56d8dff7f8c70fff8bdc7a492cb4afb9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9272 10956 bytes

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