Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ba2f8ef11eeffc…

MALICIOUS

PDF

41.0 KB Created: 2020-03-27 02:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f167ba073ca860acbc3fa82c2d2d8985 SHA-1: e6a313bcff72b4bead116d68d33a34a49f47fd0a SHA-256: 23ba2f8ef11eeffc1fe5e4a44d72f6b5040c858ba6ce479dd2e56a631575b4ff
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to 'Concepto de educacion seg unesco' and the wkhtmltopdf authoring application, suggesting a lure document. The primary attack pattern involves directing users to a network of linked PDF files hosted on various domains, likely to manipulate search engine rankings or distribute further malware.

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://kmipropertieslimited.com/uploads/1/3/0/6/130639503/130639503.html#concepto+de+educacion+seg%C3%BAn+la+unesco
    • http://rhirebllion.com/uploads/1/3/0/5/130590291/2df338cbeb.pdf
    • http://brooklynhomepropertymanagement.com/uploads/1/3/0/6/130604314/5972850.pdf
    • http://rosalindliggins.com/uploads/1/3/0/6/130639484/3375106.pdf
    • http://espressoaddict.com/uploads/1/3/0/7/130739778/5447184.pdf
    • http://www.wstransportllc.com/uploads/1/3/0/7/130775495/1926537.pdf
    • http://appspaceforpeace.com/uploads/1/3/0/5/130589342/3227771.pdf
    • http://www.daralminar.ca/uploads/1/3/0/7/130776460/5056145.pdf
    • http://vouchermarketing.com/uploads/1/3/0/3/130313748/vuwexojiluzuliz_tugisukosux.pdf
    • http://icarllc.net/uploads/1/3/0/2/130274166/wanep.pdf
    • http://bbvillahallau.com/uploads/1/3/0/4/130490774/jelagovagogavof-geruv.pdf
    • http://mightyscripture.net/uploads/1/3/0/6/130621135/gorusovaguwixix_liberavil_jatatak.pdf
    • http://laruesautoandtruck.com/uploads/1/3/0/8/130874529/gixasun_viravejivaxexu.pdf
    • http://kkaetechnology.com/uploads/1/3/0/3/130379104/tedoxumuj.pdf
    • http://www.capitalpollinatornetwork.com/uploads/1/3/0/5/130589415/6569763.pdf
    • http://wanderlustradio.com/uploads/1/3/0/6/130620996/notofepomixit.pdf
    • http://skyeguy.com/uploads/1/3/0/6/130620451/rupajitonun-vekukoba-tafudowavek-butereli.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_off0000755b.bin
ca75df926d41fe2020b59e2977014303ad572b73873fa2000dfab1dd4352958a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 8716 bytes

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