Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac9ab308d2a9530…

MALICIOUS

PDF

44.3 KB Created: 2020-04-11 09:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a0f26e2ca1559bb07c410c86c22d192a SHA-1: 61cf4a67b047ebeb43a39f7021d3fd8ec68c6404 SHA-256: 4ac9ab308d2a95303a757dc57fa7725b831f653e5556ca76cf56195b9239b0ad
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports the conclusion that this document is designed to redirect users to potentially harmful content.

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://mta-sts.mx.grandsalinelibrary.com/uploads/1/3/0/5/130588418/130588418.html#the+bhagavad+gita PDF link annotation
    • http://abundanceforyou.ca/uploads/1/3/0/3/130323794/zodalezusufel.pdfIn PDF document text
    • http://medicareplansavings.com/uploads/1/3/0/4/130483751/jusowelaruw.pdfIn PDF document text
    • http://vanhausllc.com/uploads/1/3/1/4/131453618/widaxelugigilevawuwo.pdfIn PDF document text
    • http://newyearswim.co.uk/uploads/1/3/0/4/130436141/2833842.pdfIn PDF document text
    • http://bucksenergize.com/uploads/1/3/0/2/130272232/gubakejuzob_kifixazise.pdfIn PDF document text
    • http://icalibrationservices.com/uploads/1/3/0/6/130639689/8753394.pdfIn PDF document text
    • http://inourworld.net/uploads/1/3/0/2/130287428/jesoxita.pdfIn PDF document text
    • http://emoryreindesigns.com/uploads/1/3/0/2/130287454/fogixitowekofe_lasal_poxaja.pdfIn PDF document text
    • http://greenteamgardener.com/uploads/1/3/0/3/130324385/92483747.pdfIn PDF document text
    • http://wordproconsultancy.com/uploads/1/3/1/0/131070689/7710624.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

Related samples 8

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_off00008434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8434 9028 bytes
SHA-256: 9766cfb0302d3b2826fbcfbed125a7f5f9cc294c92a485a0ff6f38bb75b0538c

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