Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a4c3a707d338e8…

MALICIOUS

PDF

80.6 KB Created: 2020-06-08 19:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a90a877764770ee78862d84ee71fffa6 SHA-1: 689c4c9783edcb7abd63042a1050ba2fa5972e8d SHA-256: 13a4c3a707d338e891092b826151f628c5415b1ec20e36f9fa68568aa35a0057
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified as a link farm. The ML classifier also flagged this PDF as malicious with high confidence. These links likely serve to redirect users to malicious content or for SEO manipulation purposes.

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://mx.phoenixlighthouse.net/uploads/1/3/0/6/130620857/130620857.html#%25D9%2585%25D8%25A7+%25D9%258A%25D9%2581%25D8%25B9%25D9%2584%25D9%2587+%25D8%25B9%25D8%25B6%25D9%2588+%25D8%25AC%25D9%258A+%25D8%25A2%25D9%258A+%25D8%25A8%25D8%25A7%25D9%2584%25D8%25AA%25D9%2587%25D8%25A7%25D8%25A8+%25D8%25A7%25D9%2584%25D9%2582%25D9%2588%25D9%2584%25D9%2588%25D9%2586+%25D8%25A7
    • http://snohomishvalleyicerink.com/uploads/1/3/1/1/131163943/f8b5d.pdf
    • http://dig-ph.com/uploads/1/3/0/6/130621220/fosozedofimenexon.pdf
    • http://northwestoksurvivalswim.com/uploads/1/3/1/6/131606133/mimufojolugatapan.pdf
    • http://staynaturalwellness.com/uploads/1/3/1/3/131384211/2768462.pdf
    • http://noahjameslovejoy.com/uploads/1/3/1/8/131856214/1357857.pdf
    • http://pangea.investments/uploads/1/3/1/1/131163725/jezuzebapel.pdf
    • http://baliboyindia.com/uploads/1/3/1/6/131606479/dowararasixom_boverefufi_kiwomilitiwuj.pdf
    • http://bokobowls.com/uploads/1/3/1/4/131407408/kamuzufodaf.pdf
    • http://hostmaster.samanthawarden.co.uk/uploads/1/3/1/3/131380467/kixuv.pdf
    • http://mercedesudaeta.com/uploads/1/3/0/7/130774970/d04c0.pdf
    • http://makingwhoopiepie.com/uploads/1/3/0/8/130873741/tijatik.pdf
    • http://dbstaffing.org/uploads/1/3/1/8/131856715/2677411.pdf
    • http://akenz.designpreviewer.com/uploads/1/3/0/2/130272440/1c2c19112bfa.pdf
    • http://crepesncream.com/uploads/1/3/0/3/130323518/80b7d0158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bezakeve.files.wordpress.com/2020/06/vekejinolewugebigatefidaj.pdf
    • https://xijijupere.files.wordpress.com/2020/06/31020810668.pdf
    • https://vajaxezef.files.wordpress.com/2020/06/xejofurubipir.pdf
    • https://xiwurigirisi.files.wordpress.com/2020/06/tufutuwagupudupide.pdf
    • https://nosuvul.files.wordpress.com/2020/06/35584741642.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
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fa18.bin
ccef90c35fdda7ba63b3006333672f8ea98a6bec7b43033d02e7a1e97ae13ffd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA18 32968 bytes
font_00_sfnt_off0000dc8d.bin
99e82f32b14b139518b294fb9b6683420488275312f4606a1dd18574ae72b1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 8608 bytes

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