Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a29fe65e0d44ed…

MALICIOUS

PDF

36.6 KB Created: 2020-05-19 13:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 3be17353f4d1d70c7373c51a687e2437 SHA-1: a2e2683a31c92a1247d2632914572b15c5cac691 SHA-256: 87a29fe65e0d44ed4b5276da4c1514e2506c8eab23b0731fcac5fdeae0d34bfa
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://johnmappin.org/uploads/1/3/1/3/131398164/131398164.html#john+deere+power+flow+bagger+parts+diagram PDF link annotation
    • http://untamedappetites.com/uploads/1/3/1/6/131637171/6413101.pdfIn PDF document text
    • http://mrsbsconsignments.com/uploads/1/3/0/6/130620401/33498848f7.pdfIn PDF document text
    • http://shazairfan.com/uploads/1/3/0/9/130969080/7935812.pdfIn PDF document text
    • http://pawleysislandwelcomecenter.com/uploads/1/3/1/1/131164168/rodalikezuxij.pdfIn PDF document text
    • http://jojoontour.eu/uploads/1/3/0/3/130313218/a9e4aebba69a468.pdfIn PDF document text
    • http://thecookeshoppe.net/uploads/1/3/0/3/130313826/c0e0d6e65.pdfIn PDF document text
    • http://anne-g.com/uploads/1/3/0/6/130604205/9301655.pdfIn PDF document text
    • http://bouncehouserentalshuntsville.com/uploads/1/3/0/8/130813582/4147940.pdfIn PDF document text
    • http://dogblobs.com/uploads/1/3/1/0/131070792/mamer.pdfIn PDF document text
    • http://flamegirlscollege.com/uploads/1/3/1/4/131483588/5733500.pdfIn PDF document text
    • http://mindbodyface.ca/uploads/1/3/0/6/130620845/xerifokevawifiw.pdfIn PDF document text
    • http://wlmproperties.net/uploads/1/3/0/6/130621917/lerinerusifiga-rilare-kodasuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 10588 bytes
SHA-256: 938058eef708349855a44835711a1ecb54e979ac11cc7c35d29eb394a6a115a8