Malicious PDF — malware analysis report

Static analysis result for SHA-256 7393f451d164d9fb…

MALICIOUS

PDF

37.7 KB Created: 2020-03-22 12:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bd0180e3e441822b3a296ef9dccde9ac SHA-1: 2e2c0450367a2c59feb30a4f4f33455166d04774 SHA-256: 7393f451d164d9fba83830a21f35d9a319a23e99c03cdcaefd988d5dfa2ebc8b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a coordinated effort to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. The document body itself appears to be a lure, with the title 'Como se redactan las conclusiones en una tesis' (How to write conclusions in a thesis) likely serving as a pretext to disguise the malicious intent.

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://carpetcleancary.com/uploads/1/3/0/2/130288320/130288320.html#como+se+redactan+las+conclusiones+en+una+tesis
    • http://unlocked.live/uploads/1/3/0/7/130776343/2678438.pdf
    • http://griffinharbor.com/uploads/1/3/0/2/130288318/guvojanu.pdf
    • http://talkingcrypto.org/uploads/1/3/0/8/130873864/6e945acaf33c0.pdf
    • http://midwestasphaltandgravels.com/uploads/1/3/0/7/130775411/8336069.pdf
    • http://wprna.com/uploads/1/3/0/2/130289519/db432c5a906f01.pdf
    • http://hounds-and-hooves.com/uploads/1/3/0/8/130813985/cc59e.pdf
    • http://www.charms2020.com/uploads/1/3/0/7/130738647/zofejofabemi.pdf
    • http://www.fromabroad.net/uploads/1/3/1/0/131071041/1810055.pdf
    • http://bigloser.com/uploads/1/3/0/5/130588672/jurus_zirabutitereson_sisagaz_nazawogut.pdf
    • http://vintagedreamstarot.com/uploads/1/3/0/7/130775965/nosabufebeg.pdf
    • http://mynaughtytime.com/uploads/1/3/0/9/130968935/e6e1c55fc9c0bc.pdf
    • http://spcwelding.com/uploads/1/3/0/6/130621969/6202085.pdf
    • http://hardshiphome.org/uploads/1/3/0/4/130436289/vokilibutujige.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_off00006c34.bin
d1a102f44ca463a17087689b3a4bafa2086cc20d7000cbd5be1ce81bcb799a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 7484 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.