Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a00110a26480a9…

MALICIOUS

PDF

88.0 KB Created: 2020-06-06 15:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: c2f2601e5e76a191719b0cb4824d9c6e SHA-1: 5d989c2f5538d42e3776f263c67ec5e67e392402 SHA-256: a4a00110a26480a9a2f381256a7c60073b8c27cd1ebebcdecc7f6567618db52f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains a URL that points to a suspicious domain. The ML classifier also flagged this PDF as malicious with high confidence. These factors suggest the document is part of a campaign to redirect users to malicious sites.

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://blackcardu.stefanaarnio.com/uploads/1/3/1/3/131380225/131380225.html#multiples+et+sous+multiples+du+m%25C3%25A8tre PDF link annotation
    • http://cpanel.olddonationband.com/uploads/1/3/1/6/131637409/ranefofuw_temipora_sugurolu.pdfIn PDF document text
    • http://malenyretreat.com/uploads/1/3/0/5/130540477/kegobemiwisesefav.pdfIn PDF document text
    • http://304.backyardsportstalk.com/uploads/1/3/0/6/130621568/e926b3e.pdfIn PDF document text
    • http://compostpick-up.com/uploads/1/3/0/2/130291640/jasive.pdfIn PDF document text
    • http://blackcardu.stefanaarnio.com/uploads/1/3/1/3/131380225/terms.htmlIn PDF document text
    • http://blackcardu.stefanaarnio.com/uploads/1/3/1/3/131380225/dmca.htmlIn PDF document text
    • http://blackcardu.stefanaarnio.com/uploads/1/3/1/3/131380225/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nulogep.files.wordpress.com/2020/06/vasatibikatanalef.pdfIn PDF document text
    • https://tojugodusino.files.wordpress.com/2020/06/76887658600.pdfIn PDF document text
    • https://puxekagoduse.files.wordpress.com/2020/06/gudobonijakomegomo.pdfIn PDF document text
    • https://bifofidolo.files.wordpress.com/2020/06/72643607721.pdfIn PDF document text
    • https://subenewa.files.wordpress.com/2020/06/vobuzojusajojovesovak.pdfIn PDF document text
    • https://jipikufe.files.wordpress.com/2020/06/wotasopelaz.pdfIn PDF document text
    • https://kadamevit594572624.files.wordpress.com/2020/06/nojikajafogepokibuw.pdfIn PDF document text
    • https://pubufifadako.files.wordpress.com/2020/06/21173241738.pdfIn PDF document text
    • https://gepalozevod.files.wordpress.com/2020/06/25003696815.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 20952 bytes
SHA-256: cfc1eb4a6516d323c3451257ba138bb8913942273c9332838970a42c0e8baf0a

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