Malicious PDF — malware analysis report

Static analysis result for SHA-256 52edb9ea8b653797…

MALICIOUS

PDF

71.1 KB Created: 2020-06-01 14:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cacbb9609556367e5f1b42c0123abc8a SHA-1: 4704a25f78bab07492ce64bc52b3091d100b3146 SHA-256: 52edb9ea8b653797bb66bffe56f1fb7eb15d9c77839202d88083cbd14fcbd948
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm for SEO manipulation or malware distribution. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://azfairhousing.org/uploads/1/3/0/6/130621278/130621278.html#que+capacidades+fisicas+requiere+el+aprendizaje+de+la+natacion
    • http://maryshawclasses.com/uploads/1/3/1/8/131856012/3378b13.pdf
    • http://mandmbakeshopnj.com/uploads/1/3/1/4/131438610/gudekiz-vewuson-kuvomofegovu.pdf
    • http://karensboutiqueonline.com/uploads/1/3/0/5/130542912/disevuzipadobab.pdf
    • http://alwayselev8.com/uploads/1/3/0/6/130620327/nowazevomuf.pdf
    • http://progressivelies.com/uploads/1/3/1/8/131860787/10e1e78d79.pdf
    • http://florianlandscape.com/uploads/1/3/0/7/130739889/ec86afe1d13e.pdf
    • http://lacopajoe.com/uploads/1/3/0/6/130604511/90a54533.pdf
    • http://thaichickenrice.com/uploads/1/3/1/8/131857914/zimep-tolotiwoj-tikazepebodeda.pdf
    • http://ashael.com/uploads/1/3/0/8/130873818/nikesozugidorezit.pdf
    • http://http//azfairhousing.org/uploads/1/3/0/6/130621278/terms.html
    • http://http//azfairhousing.org/uploads/1/3/0/6/130621278/dmca.html
    • http://http//azfairhousing.org/uploads/1/3/0/6/130621278/policy.html
    • https://rawalebono.files.wordpress.com/2020/05/93128747486.pdf
    • https://tinugezova.files.wordpress.com/2020/05/jomuz.pdf
    • https://kejujonozide.files.wordpress.com/2020/05/11255904807.pdf
    • https://gavadopojame.files.wordpress.com/2020/05/xinivanigunibi.pdf
    • https://buparobud.files.wordpress.com/2020/05/waveg.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_off0000e929.bin
1f998e59a85eafd91645a2feb755e5fc3bf5d4bcfd227fff099df61dfce9281c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 12708 bytes

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