Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf066110f1e964d…

MALICIOUS

PDF

54.8 KB Created: 2020-04-02 01:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bbc57e343c381339fa7aa0c2f6850927 SHA-1: a3cb443bc7d871ed2df0d49d7b5f1c512f78b54b SHA-256: 6cf066110f1e964de265a107f6b6e9fb7df474d6b6a7602e9826935746e40247
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF documents hosted on various domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing pages.

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://myentouragemusic.com/uploads/1/3/1/4/131406226/131406226.html#vicious+ve+schwab+genre
    • http://edwardsaircraft.com/uploads/1/3/1/0/131070566/momakujisik_merapunijev_bovaxazu.pdf
    • http://dellcolle.com/uploads/1/3/0/4/130483454/zinutemad.pdf
    • http://eyecansee.shop/uploads/1/3/0/6/130621330/voxerade_sulimu_labefipogase_wexejuzi.pdf
    • http://pathtosuccessrntobsnparker.com/uploads/1/3/0/2/130291536/157114.pdf
    • http://coachcollinsfootballcamp.com/uploads/1/3/1/3/131383514/mesum.pdf
    • http://motoringlegaladvice.com/uploads/1/3/1/1/131163834/pixinivup_nujaminasegiga_kuginukani.pdf
    • http://mountaintopcookies.com/uploads/1/3/0/6/130620789/lenuduz.pdf
    • http://incrocket.com/uploads/1/3/0/7/130775742/worerulevigalu.pdf
    • http://since1984.co/uploads/1/3/0/2/130272381/puranotubupoxem.pdf
    • http://kindredcounselling.com/uploads/1/3/0/8/130874475/webexuzediwuwo-popisukulopowu-lurumaloxuxib-pesomoguxaj.pdf
    • http://shaunasdaycare.com/uploads/1/3/0/4/130436173/3409674.pdf
    • http://kbsouthafrica.com/uploads/1/3/0/4/130488619/fakafumiginus.pdf
    • http://marketingjobopportunitieshouston.com/uploads/1/3/0/7/130739742/datolinejatoni-kizaxumo-mitulemobefuta.pdf
    • http://donnellconsultinggrp.com/uploads/1/3/0/6/130640155/pajumu-laduguk-dolinununewe.pdf
    • http://frenchgardenconcept.com/uploads/1/3/0/2/130272511/dunujowaxi_xuxepogiwarigip_rikezijaserixu_bijej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a41a.bin
0969e06d5eedd1f98f8004230c7e0fd2550261bb489e6746182e358b89c2a884
pdf-font-stream PDF embedded font (sfnt) at offset 0xA41A 8376 bytes
font_01_sfnt_off0000c47f.bin
3fcdfaec1d071b52e2e7545c8a6954a325c3bcea4734fa4db0288e21656be546
pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 2644 bytes