Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a107fec8b5fd6b4…

MALICIOUS

PDF

44.7 KB Created: 2020-03-23 08:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ea4bb8195cacf84082ee3d4f39cc2b0 SHA-1: 48296c718d748b00d5c2c9acac2740640857d544 SHA-256: 3a107fec8b5fd6b4536e5f039b92a3ffce54166e96995300527a2bab09c3cc66
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or to host malicious content. The document body, though partially corrupted, indicates a lure related to educational materials. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://ne-surgerycenter.net/uploads/1/3/0/3/130312919/130312919.html#solucionario+fisica+y+quimica+1+bachillerato+mcgraw+hill+smartbook
    • http://sydneyhospitalitysolutions.net/uploads/1/3/0/5/130590525/3c98786236.pdf
    • http://by-k.net/uploads/1/3/0/4/130483062/1995022.pdf
    • http://easyak.com/uploads/1/3/0/3/130313454/nigavov.pdf
    • http://shawndgay.com/uploads/1/3/0/8/130873941/a11090507d01db.pdf
    • http://www.marketprospectorsupport.com/uploads/1/3/0/7/130774993/banuwifexavudewoz.pdf
    • http://lydiadolchconsulting.com/uploads/1/3/0/2/130287945/nunuxare.pdf
    • http://aleksandrajoy.com/uploads/1/3/0/5/130550763/tamutu.pdf
    • http://thenetworker.org/uploads/1/3/0/4/130489066/lelajijiwipukibopexa.pdf
    • http://radiomusicsociety.com/uploads/1/3/0/7/130739525/2251639.pdf
    • http://soulstarmassage.com/uploads/1/3/0/6/130639554/8ca3d15a5fa6eda.pdf
    • http://dinoarcode.com/uploads/1/3/0/6/130604336/8275461.pdf
    • http://mta-sts.mail.cleanfieldproducts.com/uploads/1/3/0/9/130969236/9623803.pdf
    • http://eagleviewuav.com/uploads/1/3/0/9/130969658/fe32b8d457.pdf
    • http://naturalcityfurniture.co.uk/uploads/1/3/0/4/130483558/pujazi.pdf
    • http://aronweisgerber.com/uploads/1/3/0/9/130969061/gobakiwolox.pdf
    • http://litemann.com/uploads/1/3/0/4/130435573/gegigizawuwog_kivefo.pdf
    • http://www.health-hope-and-freedom.com/uploads/1/3/0/7/130739680/1bbe7.pdf
    • http://kempercpa.net/uploads/1/3/0/4/130477351/7182010.pdf
    • http://africanretreats.com/uploads/1/3/0/6/130603836/resusuminija.pdf
    • http://cinurl.com/15vc92
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071dc.bin
1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 6444 bytes
font_01_sfnt_off0000819e.bin
5eb3c2478c4e125c14aa00087c4edd3f1bfc6f2f4d71e1b0c197767a0c013cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 9692 bytes

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