Malicious PDF — malware analysis report

Static analysis result for SHA-256 842fca942fb141cb…

MALICIOUS

PDF

34.7 KB Created: 2020-03-19 06:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bf61c27f12785965dad0f7c4a71137f4 SHA-1: 8bbdd5104e93235fe8a9b5cf3742866a672f3de1 SHA-256: 842fca942fb141cbb628417a2e2f2ca1ebbe3ab5618b17b81584b02de67736c3
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 to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact payload or intent beyond the link distribution.

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://navice.org/uploads/1/3/0/9/130969062/130969062.html#modelo+humanista+integrador+basado+en+competencias+uatx+pdf
    • http://hairbrainedbrands.com/uploads/1/3/0/4/130435786/54173a36d67c58.pdf
    • http://freightpro.express/uploads/1/3/0/7/130775143/4901126.pdf
    • http://mail.oroshaza-anno.hu/uploads/1/3/0/9/130969678/dafunom_pimibere.pdf
    • http://theteachingconnection.net/uploads/1/3/0/2/130287992/66c613.pdf
    • http://hidefdjs.com/uploads/1/3/0/3/130323884/xujizumitoxe.pdf
    • http://legionsupplements.net/uploads/1/3/0/5/130589286/20d1d260.pdf
    • http://huntsville.pickupyourparty.com/uploads/1/3/0/8/130813885/muren-bozifigaw.pdf
    • http://onlineassist.net.au/uploads/1/3/0/6/130620530/vupaxukarip.pdf
    • http://notarypublicincalifornia.com/uploads/1/3/0/6/130621209/ca72417155.pdf
    • http://redirecttestthingy.com/uploads/1/3/0/3/130323156/f481308f73ee7.pdf
    • http://talkingpolitics.co.uk/uploads/1/3/0/5/130541346/4c61b5b.pdf
    • http://chaoscaffeineandakeyboard.com/uploads/1/3/0/5/130550874/fexanus-vozumigare-titavoxo-bidipozex.pdf
    • http://shannoncrandall.com/uploads/1/3/0/6/130640114/8284023.pdf
    • http://www.kingcactus.org/uploads/1/3/0/4/130435929/8350121.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_off00005f85.bin
26f31e4e3e4d6b5d321b2299d55e00a00ab449726239c6583e31e77c0762f6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 8060 bytes

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