Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35aec91df77f433…

MALICIOUS

PDF

40.8 KB Created: 2020-03-26 02:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0595b72cabf69e464a85686a3535350d SHA-1: 2396453f3b6f781f6715125c4da1e6ef50d4d3b2 SHA-256: a35aec91df77f43311d260fa71f606335b2a929b19b43c55a876ce449406bb2b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body, though partially corrupted, includes text related to AutoCAD scaling and metadata indicating it was generated by wkhtmltopdf. This suggests a link farm or SEO spam campaign designed to drive traffic to these external sites, potentially for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://ebmccallanbuildingltd.com/uploads/1/3/0/5/130540645/130540645.html#como+cambiar+la+escala+aun+dibujo+en+autocad
    • http://www.autokussen.nl/uploads/1/3/0/3/130379145/4424535.pdf
    • http://binghaoy.com/uploads/1/3/0/6/130620878/6408278.pdf
    • http://deep-cloud-ai.com/uploads/1/3/0/8/130874676/gebowekaz.pdf
    • http://apollotale.com/uploads/1/3/0/9/130969954/xezegafofilufogezoz.pdf
    • http://mshousekeeper.com/uploads/1/3/0/7/130776312/majufewozid-neruravajeba-zudonetedi-damofulazu.pdf
    • http://suzieboots.com/uploads/1/3/0/6/130604606/guxatazo_wimisovuvekiwa.pdf
    • http://oosternieland.net/uploads/1/3/0/5/130588928/mixoxebameliresizi.pdf
    • http://yellowbirdportraits.com/uploads/1/3/0/8/130813616/wifutidatadewur_kinasolunutike.pdf
    • http://satellitesessionsmusic.com.au/uploads/1/3/0/3/130379676/375083.pdf
    • http://theawesomeguide.com/uploads/1/3/0/6/130603764/gujubevu.pdf
    • http://artzyisrael.com/uploads/1/3/0/6/130621610/c41c8.pdf
    • http://familykinection.com/uploads/1/3/0/2/130270894/fezenuganis_senada_wigulosi.pdf
    • http://ftp.larowing.com/uploads/1/3/0/7/130739213/kadig.pdf
    • http://www.business-transformation.nl/uploads/1/3/0/7/130739517/balanegaga.pdf
    • http://southernfarmandgarden.com/uploads/1/3/0/6/130604477/zobexawamu.pdf
    • http://www.fournildejean.com/uploads/1/3/0/5/130539899/5879475.pdf
    • http://rubioutlet.com/uploads/1/3/0/2/130289668/madosisupajozed_bipinuw.pdf
    • http://aptios.org/uploads/1/3/0/6/130620997/a13afd.pdf
    • http://translantau.transasiaseries.com/uploads/1/3/0/7/130776067/peranazole.pdf
    • http://nips4tips.com/uploads/1/3/0/7/130739029/b86d6.pdf
    • http://nastranskincare.net/uploads/1/3/0/5/130590241/1732583.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_off000073a0.bin
6be684f95f2bafa53f3a472a7cf17623e8fcc2b4bc6ae8c4fa91f27c783a5cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 8768 bytes

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