Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4b0cffcae58702…

MALICIOUS

PDF

40.4 KB Created: 2020-06-11 18:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c36514aeadb51c554e0ebdbdb7abc4d4 SHA-1: c349d5e4ac05c2801ca8d545827c7482204ea317 SHA-256: 5c4b0cffcae58702e86c7104ca329897e98d91b52a9d286b78f228f4e6665463
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files on unrelated domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content or facilitate further compromise.

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://strawkite.com/uploads/1/3/0/6/130621938/130621938.html#weekly+worksheet+template
    • http://usrlogistic.com/uploads/1/3/1/0/131070619/fulitawotem.pdf
    • http://uniquelymoved.com/uploads/1/3/0/6/130620509/1558917.pdf
    • http://shinebrightdaily.org/uploads/1/3/0/7/130740297/nolidepiforofav.pdf
    • http://johnloughton.net/uploads/1/3/1/4/131406211/10ccdefe7ca9432.pdf
    • http://jackglass.com/uploads/1/3/0/6/130604785/lamukano.pdf
    • http://lefseland.com/uploads/1/3/0/3/130312950/tadozamaworate.pdf
    • http://transformationninja.com/uploads/1/3/0/4/130477039/berale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://guponuz.files.wordpress.com/2020/06/64639754659.pdf
    • https://zozijonatoto.files.wordpress.com/2020/06/wopemufotuzusageke.pdf
    • https://woxebomogona.files.wordpress.com/2020/06/zediwuvajiwimulovemawi.pdf
    • https://lubaxop.files.wordpress.com/2020/06/13412952736.pdf
    • https://gakirebeb.files.wordpress.com/2020/06/julovezimepesito.pdf
    • https://muburojiz.files.wordpress.com/2020/06/80718447871.pdf
    • https://xilogip.files.wordpress.com/2020/06/49886794840.pdf
    • https://mopotafuv.files.wordpress.com/2020/06/buzuraridufetipugugi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714b.bin
c82dbecfd1fb9c116b1d10bfdf449e0b46a959a8a4a43e44111a4b7c2e579c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714B 10784 bytes

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