Malicious PDF — malware analysis report

Static analysis result for SHA-256 080adc81a8cba9e9…

MALICIOUS

PDF

44.3 KB Created: 2020-04-07 09:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 153ec9a76d6f497843aa38c40048efe8 SHA-1: df37511978d5e9ff698309e9ce701cbb6b528378 SHA-256: 080adc81a8cba9e9d662f272ceb3ae61378f386b53317db6f7195e759053a752
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, includes a URL that aligns with the link farm activity. This suggests the document is part of a link farm or SEO spam campaign, potentially leading to malicious content.

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://beyondhillco.com/uploads/1/3/0/4/130483565/130483565.html#oracion+de+los+fieles+para+matrimonio
    • http://davidsonspiritwear.com/uploads/1/3/0/4/130476244/lodumenol.pdf
    • http://stuccovenetiano.com/uploads/1/3/0/3/130323564/wirajot.pdf
    • http://100percentmaintenance.com/uploads/1/3/1/3/131379514/gatilijega.pdf
    • http://erincrider.org/uploads/1/3/0/6/130620538/bb8582fdf203.pdf
    • http://plattsburghdogtrainer.com/uploads/1/3/0/3/130313536/33a66cb66.pdf
    • http://maritimehobbies.com/uploads/1/3/0/5/130588796/3408390.pdf
    • http://thepivotacademyllc.com/uploads/1/3/0/4/130491008/bunotikapisup.pdf
    • http://beachrealestatepros.com/uploads/1/3/0/9/130969596/3121232.pdf
    • http://agenciaaman.org/uploads/1/3/0/7/130776049/negewev.pdf
    • http://flipintofuninfirst.com/uploads/1/3/0/8/130873718/ec10b.pdf
    • http://theserviumgroupinc.com/uploads/1/3/0/4/130475883/2004541.pdf
    • http://pbs-security.com/uploads/1/3/0/7/130739445/sizobekavizek.pdf
    • http://tammybrideau.com/uploads/1/3/0/4/130489143/50f225f.pdf
    • http://beyondkoultureautism.com/uploads/1/3/1/3/131383657/gexetutogoje.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_off000083cf.bin
34aca20536d34796f607d93c02d2ebaabddfd7dbf9f4ee8dcc9e2213e137df17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CF 8296 bytes

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