Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fa064cdf9eb1b8…

MALICIOUS

PDF

52.7 KB Created: 2020-06-20 19:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93a0943f9a1b77d07129fa9b4310c2c5 SHA-1: c9ae665c3d1545fe779a10cd1c5a6b71e6c349e9 SHA-256: 82fa064cdf9eb1b807e1088d8052c885b83ec63748f057a764c67e9d98ae28dd
136 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDF files, many of which are hosted on suspicious domains and appear to be part of a link farm. The document body also contains a link related to 'DNS hijacking tutorial', suggesting a social engineering pretext. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links indicates an attempt to redirect the user to potentially harmful content or further stages of an attack. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://recover-limited-account.info/uploads/1/3/0/9/130969940/130969940.html#dns+hijacking+tutorial
    • http://mail.iamhighlyeducated.com/uploads/1/3/0/5/130588239/0fd4a619c02.pdf
    • http://oxhillreds.com/uploads/1/3/0/9/130969300/515372.pdf
    • http://samtaylorcycles.com/uploads/1/3/0/4/130476277/wemenimorevedas-temodoguzak-bigapomasanaki.pdf
    • http://3577productions.com/uploads/1/3/1/3/131382693/1551866.pdf
    • http://spiritfestfl.com/uploads/1/3/0/9/130969471/52463522e740657.pdf
    • http://melerd.com/uploads/1/3/0/7/130739250/potogoxo_narukev_zuniwipaf_kujasate.pdf
    • http://mta-sts.mx.kiersykaydesigns.com/uploads/1/3/0/3/130313319/fekasenez.pdf
    • http://yaelgrinberg.com/uploads/1/3/0/9/130969701/c1374ee55628d15.pdf
    • http://cpanel.newgeorgiaclaywork.com/uploads/1/3/1/1/131164352/9686097.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f80.bin
dad1278e4af3c2549caa9e2a809e05464e0c8228478d70d093634f6d7ad43550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F80 4964 bytes
font_01_sfnt_off0000a052.bin
adb2615279e2caab3fbf4ce8920ec9ddd8e9f13d3fc6413cd4ab34fa28a16f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA052 11704 bytes

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