Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f39bda0898d7e31…

MALICIOUS

PDF

36.4 KB Created: 2020-04-04 16:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 936817ed1efe9204263f59c9972bb96d SHA-1: 3b8b6d9aaa0aa7ef997fd446a6f484dadde0c1ec SHA-256: 5f39bda0898d7e31c938b9ff52e2a1295c084737200e1d9d133c1f3d38e134b3
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 point to other PDF files hosted on similar domains. The ML classifier strongly indicated maliciousness. The embedded URLs suggest a link farm or SEO spam tactic, potentially leading to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

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://itsourparty.com/uploads/1/3/0/7/130775431/130775431.html#programas+de+aplicacion+definicion
    • http://heartlandjoy.com/uploads/1/3/0/6/130621284/5366533.pdf
    • http://thelawnation.com/uploads/1/3/0/5/130588366/mibodaxojunuv_befiperelitu_gugix.pdf
    • http://learningbehaviorsolutions.org/uploads/1/3/1/3/131379219/658c3b70214.pdf
    • http://benjamenandlexus.com/uploads/1/3/0/6/130639982/453de.pdf
    • http://wardpearsongroup.com/uploads/1/3/0/7/130740011/duvifu-gizudi-marakexezof-kejijudo.pdf
    • http://573chili.com/uploads/1/3/0/6/130639805/fenujegowukurabu.pdf
    • http://bodyfitme.com/uploads/1/3/1/1/131164455/rogilis.pdf
    • http://vrindavancapital.com/uploads/1/3/0/5/130545484/kusesamolubusonurure.pdf
    • http://www.thefirstchoicenotary.com/uploads/1/3/0/6/130620406/litedomezer-mutimezu-kenorarimuke.pdf
    • http://oswnaturals.com/uploads/1/3/0/6/130604799/528c91100ed2ef.pdf
    • http://pedagogyinyourpocket.com/uploads/1/3/0/9/130969987/8384651b.pdf
    • http://towingsurrey.com/uploads/1/3/0/5/130550901/bepedufexivifir.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_off000064ff.bin
454689a1ffdae9b171d23454ba09fd480626e3b6593a8ed7f0871b2a325cf7ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 8248 bytes

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