Malicious PDF — malware analysis report

Static analysis result for SHA-256 626495fcabc1ca16…

MALICIOUS

PDF

49.4 KB Created: 2020-03-26 02:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8a9f7da7be5dd21bf872959ff218ea1a SHA-1: 2bb951fe012f35f2a32b601e9b933191621a85b6 SHA-256: 626495fcabc1ca1688d6dd4f6c44de1b5ce6086ae5f095f03d37d9ce16efc5c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing indicating a 'PDF_SEO_LINK_FARM' with 30 external links. The document body also contains a primary URL and numerous other URLs pointing to PDF files on various domains. This suggests the document's primary purpose is to redirect users to a large number of external resources, likely for SEO manipulation or to host further 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://ckcooling.com/uploads/1/3/1/0/131070001/131070001.html#ejemplos+de+tda%E2%80%99s
    • http://waterthrifty.com/uploads/1/3/0/5/130539728/0f905aeb230.pdf
    • http://learneventpainting.com/uploads/1/3/0/2/130271201/8a87e4935a5d6.pdf
    • http://triosreadydentallaboratories.com/uploads/1/3/0/2/130272424/1479482.pdf
    • http://espacioparametrico.org/uploads/1/3/0/7/130776100/d99a7.pdf
    • http://redfordthurstonfootball.com/uploads/1/3/0/5/130545199/wefarojotajujimugap.pdf
    • http://achillesstravoravdis.com/uploads/1/3/0/7/130775750/noxenabubokizigegado.pdf
    • http://oritlabs.com/uploads/1/3/0/2/130289278/rudagokovu_wubobunavefi_falilawikafa.pdf
    • http://weeknightworkout.com/uploads/1/3/0/5/130547024/pelenosutaj.pdf
    • http://hisaairport.info/uploads/1/3/0/7/130740414/fesifun.pdf
    • http://hawgear.net/uploads/1/3/0/6/130620929/petarobi-nazefodoxi.pdf
    • http://northernstarproperty.com/uploads/1/3/0/7/130775241/564cf1049.pdf
    • http://extremecleanpw.com/uploads/1/3/1/3/131379202/xidikawovew-namipo-zosagasiginura-zuwamazeremoja.pdf
    • http://sdseco.com/uploads/1/3/0/2/130288710/mefiw-kazigekigaratom-zuxosevulo.pdf
    • http://www.sv-liebstadt.de/uploads/1/3/0/3/130312916/77d1a8c6fa01c.pdf
    • http://lyle-sightings.com/uploads/1/3/0/5/130543569/wumowegisuxedaw.pdf
    • http://designsbysuede.com/uploads/1/3/0/5/130543093/71900ecfe638a8e.pdf
    • http://ambtcex.com/uploads/1/3/0/7/130739287/6a231432.pdf
    • http://www.jgriffithwriter.net/uploads/1/3/0/9/130969001/gobumedinabom.pdf
    • http://fashionthinkers.com/uploads/1/3/0/2/130291809/rifagipa.pdf
    • http://modern-energy.co.uk/uploads/1/3/0/3/130379581/eeefc.pdf
    • http://www.sealsresearchanddevelopment.com/uploads/1/3/0/6/130604560/teforelaneri.pdf
    • http://klbhc.com/uploads/1/3/0/3/130323754/781309.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fdc.bin
90b6623defeb90d3d5410e2d4dfbb110ef4b3d1fb6df0900791e29446c50a988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDC 8892 bytes
font_01_sfnt_off0000a075.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA075 16204 bytes

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