Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84134cf8158df52…

MALICIOUS

PDF

36.9 KB Created: 2020-04-05 13:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f407107d135576760df52263c05443ad SHA-1: 1e57d3b5b52e4bf2e2c024e09ed71798da8a3519 SHA-256: f84134cf8158df520cd8a3c4d24578239b4e9aa3bb63e5cfcfe9753eb9c0bff3
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO spam or phishing. The document body, though partially corrupted, contains the phrase 'Numeros enteros ejercicios 1 eso resueltos' and references 'wkhtmltopdf', suggesting a lure to educational content that redirects to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm or phishing attack.

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://marilynphillipsinsurance.net/uploads/1/3/1/3/131384552/131384552.html#numeros+enteros+ejercicios+1+eso+resueltos
    • http://inteliser.com/uploads/1/3/0/5/130551342/marexi_dexatuborovuva_dijudopukogeli_figuj.pdf
    • http://pitchinggame.net/uploads/1/3/0/6/130604016/xakapudifix-mikerewozexi-bivixasa-xiluzutadebezi.pdf
    • http://okawari-jpn.com/uploads/1/3/0/5/130543764/zobotosebunirajaper.pdf
    • http://mikefennessy.com/uploads/1/3/0/2/130287929/27bd1fa4df8b.pdf
    • http://mintofarm.ca/uploads/1/3/1/4/131437425/morimo.pdf
    • http://michaelrosebaby.com/uploads/1/3/0/6/130604615/tudukutelarime.pdf
    • http://gr8nessent.com/uploads/1/3/0/6/130621989/aaa426a58418b.pdf
    • http://kqlw.org/uploads/1/3/0/7/130776801/428024.pdf
    • http://societe-s-metras.ca/uploads/1/3/0/8/130874347/5e9271293.pdf
    • http://emilybatsford.com/uploads/1/3/0/4/130489475/migesowizigepa_nebazet.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_off00006699.bin
3c822429ec7e719df3f974c29e38c0321edd053ceafb692ffd7a55bb4f28b649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 8384 bytes

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