Malicious PDF — malware analysis report

Static analysis result for SHA-256 3825b40b7fec3296…

MALICIOUS

PDF

36.5 KB Created: 2020-04-05 09:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c1d90ee2745d626f38eb07755dc679e SHA-1: 704a5b4ef2b513ed9ea43cdb7cc1f4b38c2b37ad SHA-256: 3825b40b7fec329609d4d4e56a2d983283c8a2cdade03a0fc14f665760e38b36
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, while appearing to be about math problems, is likely a lure to disguise the malicious link farm.

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://abhmembers.com/uploads/1/3/0/2/130287973/130287973.html#problemas+de+razonamiento+matematico+quinto+de+primaria
    • http://navionaero.com/uploads/1/3/0/6/130620443/xagaket.pdf
    • http://wildrosevintage.shop/uploads/1/3/0/3/130379251/9729444.pdf
    • http://allisonevansphd.com/uploads/1/3/1/4/131437474/sedimukawes.pdf
    • http://mb-expert.com/uploads/1/3/0/5/130539926/a78ccb.pdf
    • http://mariettebasson.com/uploads/1/3/0/6/130639406/luzovunula_jekizetofike_zelapelo_gagexorapof.pdf
    • http://cdwwarehouselogistics.com/uploads/1/3/0/2/130289233/8524666.pdf
    • http://seed2superfood.com/uploads/1/3/0/4/130488732/bakedi.pdf
    • http://mindysjourney.org/uploads/1/3/0/2/130288394/zuwodawuzo-newumud-vuruw.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_off000064cc.bin
22629206703a78988dd4eac5513491d304fa70acbd5ec0202ab3cc310cdc743b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CC 8412 bytes

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