Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5e78598a67508c…

MALICIOUS

PDF

65.6 KB Created: 2020-03-11 12:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d38fd1b7e5ec1b3cb0bada0017e851a5 SHA-1: d200dba257fdae0b3900cb260872be0082ef0217 SHA-256: ba5e78598a67508cc658efef1e734c1441eb497f5a68b09c3b2ee19ca10ad30e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many pointing to PDF files with numeric slugs, indicative of a link farm or SEO abuse. One of the embedded URLs, http://holoholofuntravel.com/uploads/1/3/0/7/130775643/130775643.html#depression+cbt+interventions, is directly visible in the document body. The primary function appears to be redirecting users to potentially harmful websites.

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://holoholofuntravel.com/uploads/1/3/0/7/130775643/130775643.html#depression+cbt+interventions
    • http://mespinozamen.com/uploads/1/3/0/8/130874292/7070502.pdf
    • http://raphel.com/uploads/1/3/0/7/130739584/nidesitadokuzedaz.pdf
    • http://getstoaked.org/uploads/1/3/0/5/130589158/wizakun.pdf
    • http://metoomvntinfo.com/uploads/1/3/0/7/130740178/8e7fb2ad1655d.pdf
    • http://www.fitcarrot.com/uploads/1/3/0/7/130776786/7579448.pdf
    • http://highsierra.com.co/uploads/1/3/0/6/130621055/f8bc0b.pdf
    • http://peghorner.com/uploads/1/3/0/4/130483402/1823786492.pdf
    • http://adimef.com/uploads/1/3/0/3/130323723/vuposikurimom_nevugesis.pdf
    • http://shoplalarie.com/uploads/1/3/0/3/130379239/c21e8e.pdf
    • http://www.starstrings.com/uploads/1/3/0/4/130476065/dupamapexop.pdf
    • http://path2knit.com/uploads/1/3/0/7/130739712/zerodoguniwel-lokaxad.pdf
    • http://nickipopereading316.com/uploads/1/3/0/6/130620943/rufakurivi.pdf
    • http://wbiphonescreenrepair.com/uploads/1/3/0/7/130739147/29b2a1a0bb1a33.pdf
    • http://clubonetc.com/uploads/1/3/0/2/130272442/vuzunuja.pdf
    • http://alcorndesigns.com/uploads/1/3/0/4/130483494/799ca6099a4da.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_off0000d78f.bin
cbc4bc0f12b88a32abaa2bc2d619cee6cc27fe982cfbe2ecbb5c851fe033d5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 8500 bytes

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