Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac36ac1abf86e658…

MALICIOUS

PDF

43.0 KB Created: 2020-03-25 07:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 952e5b0af72feae2ee3c686ba74b6422 SHA-1: 18f331d19d1b3e89066c183b224fdf0e97c06629 SHA-256: ac36ac1abf86e65812154727e3085d425f0c24c2643cb57cd82fbf5d50d4cd00
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The primary lure appears to be related to mathematical equations, as seen in the document body and URL fragments. No scripts were extracted from this sample.

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://addycakescookies.com/uploads/1/3/1/3/131380627/131380627.html#ecuacion+de+la+recta+tangente+horizontal PDF link annotation
    • http://underbuy.us/uploads/1/3/1/0/131070231/puxinumotojud.pdfIn PDF document text
    • http://tribalethics.org/uploads/1/3/0/8/130874329/dosed.pdfIn PDF document text
    • http://chavezchallenge.com/uploads/1/3/0/4/130476130/jadimejoja.pdfIn PDF document text
    • http://hostmaster.wildorigins.com.au/uploads/1/3/0/5/130550929/bezipogilativerokelo.pdfIn PDF document text
    • http://www.atx360.net/uploads/1/3/0/6/130639235/2d681.pdfIn PDF document text
    • http://www.360etherapeutics.com/uploads/1/3/0/6/130640102/nazexiroga.pdfIn PDF document text
    • http://facialplasticsurgery.news/uploads/1/3/0/6/130604626/d84f6ea.pdfIn PDF document text
    • http://jcrgraphics.com/uploads/1/3/0/6/130640019/1799132.pdfIn PDF document text
    • http://casinographics.com/uploads/1/3/0/4/130436204/1397650.pdfIn PDF document text
    • http://autodiscover.scholarshipsforscholarsofmontebello.org/uploads/1/3/0/6/130620237/6728337.pdfIn PDF document text
    • http://heathermckenziemusic.com/uploads/1/3/1/1/131163590/mudegimiposakuseposa.pdfIn PDF document text
    • http://breannavinsonphotography.com/uploads/1/3/1/1/131163991/4d77fdf8eed846.pdfIn PDF document text
    • http://triplenewsworld.com/uploads/1/3/0/7/130776407/4118258.pdfIn PDF document text
    • http://mta-sts.plainfieldgirlscouts.org/uploads/1/3/0/2/130287243/56f4270c4a.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8D 9532 bytes
SHA-256: bc651bbf69368b5a8036670cd13f77fe20582f02deaad42b8fa52c263e60e4d6