Malicious PDF — malware analysis report

Static analysis result for SHA-256 036942b5720aa310…

MALICIOUS

PDF

41.4 KB Created: 2020-03-29 01:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bef2f8bb1ceb879e197b1401f282876b SHA-1: d037df49e2fa78828ffacabecf2126de9517fa7c SHA-256: 036942b5720aa310c9452b3d02edc8a4450104623ce11813a2d2d84bec592bc4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent, likely to distribute further content or manipulate search engine results. 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://tcsonline.net/uploads/1/3/0/4/130435622/130435622.html#antecedentes+historicos+de+un+restaurante
    • http://brittahomeopathy.com/uploads/1/3/1/1/131163876/8b50e78fe96c.pdf
    • http://vehicleloanusa.com/uploads/1/3/0/3/130379271/nevox-laledatevi-zepofixon-vanefonos.pdf
    • http://cbtutoring.com/uploads/1/3/0/3/130323159/6eb19fe54716.pdf
    • http://mta-sts.mx.drjonhaag.com/uploads/1/3/0/5/130589050/83a61ec5.pdf
    • http://sellochouses.com/uploads/1/3/0/2/130272342/9835428.pdf
    • http://francestors.com/uploads/1/3/0/6/130639956/wefopod.pdf
    • http://dessertwarsmiami.com/uploads/1/3/0/4/130489841/givajefataki.pdf
    • http://dorota.blog/uploads/1/3/0/7/130739754/b61b9478ee151.pdf
    • http://vivtransoline.biz/uploads/1/3/1/1/131163836/421e71e73c.pdf
    • http://theseconddeadlysin.com/uploads/1/3/0/8/130874296/4542868.pdf
    • http://wonderfulwoolwich.co.uk/uploads/1/3/0/5/130543010/5646121.pdf
    • http://myguyinvegas.com/uploads/1/3/0/4/130479123/duberi.pdf
    • http://mybloomyoga.com/uploads/1/3/0/2/130287284/3503942.pdf
    • http://my-drink-list.com/uploads/1/3/0/8/130874313/tefavuxo.pdf
    • http://bandtampa.com/uploads/1/3/0/6/130605475/3483637.pdf
    • http://cardinalswbb.net/uploads/1/3/0/3/130379675/8181542.pdf
    • http://www.sparealunch.org/uploads/1/3/0/4/130476208/f437b.pdf
    • http://jedrietveld.com/uploads/1/3/0/7/130739289/bavopalebogenav_jokusodamugote.pdf
    • http://drlyons.net/uploads/1/3/0/7/130776131/bd4fc733.pdf
    • http://aliasdatabaseservices.com/uploads/1/3/0/6/130621500/9408383.pdf
    • http://citisecurities.in/uploads/1/3/0/5/130550768/17495e0b54593b0.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_off0000760e.bin
7926bb459fa1ba6f93b7afb95edeeac1c3e8ed54cf1dd66fc635363f194998a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 9160 bytes