Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c9315888c1d2bf…

MALICIOUS

PDF

43.1 KB Created: 2020-03-24 15:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3876370860b157925f1ffe54a7745c9a SHA-1: 9d5b4bb487902afa7727353a9d79d5a46e2815ee SHA-256: 62c9315888c1d2bf3da80e341ef719f9c106962303cb388593608d6b48d5605a
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are structured as a link farm, suggesting a malicious intent to redirect users. The document's content, presented as a statistical significance report, is a lure to encourage clicks on these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link-farming attack pattern.

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://srvcapital.net/uploads/1/3/1/0/131069806/131069806.html#nivel+de+significaci%C3%B3n+estadistica
    • http://electbradsupervisor.com/uploads/1/3/0/6/130604388/8897842.pdf
    • http://metzmtaloysius.com/uploads/1/3/0/3/130313284/7391461.pdf
    • http://tradeandfinance.it/uploads/1/3/0/6/130603959/fokarasuwiwu.pdf
    • http://richfitkc.com/uploads/1/3/1/0/131069935/zozapetede.pdf
    • http://evergrowthconsulting.com/uploads/1/3/0/6/130621443/708930.pdf
    • http://kimleephotography.net/uploads/1/3/0/6/130604470/nopunamalikogi-gidur-vuvop-tukowovape.pdf
    • http://amazenhair.com/uploads/1/3/0/4/130476703/9456796.pdf
    • http://patronbarber.com/uploads/1/3/0/7/130775441/roxopakaxof.pdf
    • http://sincerelyshameem.com/uploads/1/3/0/4/130488213/6f5e97266.pdf
    • http://voreckapp.com/uploads/1/3/0/4/130476574/tukewevonoluromure.pdf
    • http://fitnessministry.org/uploads/1/3/0/2/130289406/dfdf90c45652.pdf
    • http://www.bardswine.com/uploads/1/3/0/5/130543684/mixawejomuwi.pdf
    • http://millerignitesllc.com/uploads/1/3/0/4/130483759/3349032.pdf
    • http://adumpsterfire.com/uploads/1/3/0/8/130873740/kumovow-rekukirodew-zazuxo.pdf
    • http://root.harrisvillegolfcourse.com/uploads/1/3/0/7/130775750/rinogigujisoloruv.pdf
    • http://mta-sts.swatimetals.com/uploads/1/3/0/4/130483949/70a035c8798eb.pdf
    • http://www.turismovarzi.com/uploads/1/3/0/2/130291449/bojabomexaba.pdf
    • http://webloginsyapikredis.com/uploads/1/3/0/5/130588529/wadikokepa.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_off00006f18.bin
b7f694dfff7844f05d989e8905fe1d5960912dfb2e7d21c2d19c90bb508d0765
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F18 9620 bytes
font_01_sfnt_off000091d9.bin
bde6ac526b6854542e6450ebc5352056f1aa824e72604b4e3a91c39d3e5ce606
pdf-font-stream PDF embedded font (sfnt) at offset 0x91D9 3088 bytes