Malicious PDF — malware analysis report

Static analysis result for SHA-256 670860caea7923ed…

MALICIOUS

PDF

36.1 KB Created: 2020-03-11 11:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 88afd60860cb3e2e7f674405afe20040 SHA-1: db5b91355376b94f59fd2f216774bff0ddb2a1cc SHA-256: 670860caea7923ed19b6b0bf9c2bae88901edd180e79ee1eb9635c36207bc97f
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicating it is likely part of an SEO spam or link farm operation. The document body, though heavily obfuscated, contains text related to "Rotation worksheets math drills" and embeds URLs pointing to other PDF files and HTML pages, suggesting a tactic to drive traffic to malicious or spam content. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

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://webdisk.jacksonvilleartistsguild.org/uploads/1/3/0/8/130873829/130873829.html#rotation+worksheets+math+drills
    • http://www.raapremiereproperties.com/uploads/1/3/0/4/130490386/0c5db.pdf
    • http://myangeliccouture.com/uploads/1/3/0/4/130477945/tolakoben_kodizotidi_biponiwi_megape.pdf
    • http://kallure.shop/uploads/1/3/0/5/130590702/7f268aef.pdf
    • http://zonemaster.sprankelendecommunicatie.nl/uploads/1/3/0/6/130605384/3164794.pdf
    • http://www.janhaldane.com/uploads/1/3/0/6/130621591/8892992.pdf
    • http://edenmeetingsandevents.net/uploads/1/3/0/9/130969896/8d9af1f331dbdf.pdf
    • http://heartsforrainbows.org/uploads/1/3/0/7/130738639/fcb8bb9.pdf
    • http://theogrossman.com/uploads/1/3/0/5/130544694/5861654.pdf
    • http://ricardographicsd.com/uploads/1/3/0/9/130969834/xedegagikofewib.pdf
    • http://www.djabmolasi.com/uploads/1/3/0/5/130540559/6616402.pdf
    • http://www.aconvenientreality.com/uploads/1/3/0/8/130874136/jabilalike-kedokisawoven-gupekegofo.pdf
    • http://www.ekoorbbaker.com/uploads/1/3/0/3/130323249/6174224.pdf
    • http://angelstread.com/uploads/1/3/0/7/130775116/fenilu.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_off000065a9.bin
bc09f00453a0fea803207c344a7c76359793a5490f5eb436e167779c6c61179b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A9 7584 bytes

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