Malicious PDF — malware analysis report

Static analysis result for SHA-256 715aa15da0246c9b…

MALICIOUS

PDF

47.1 KB Created: 2020-03-24 02:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9cb5382105b6da5d5612c28a892b047c SHA-1: 3034fa1db00b4d4860aff969c9250db115c4a81b SHA-256: 715aa15da0246c9b3d0cce1a2186493cb29578960a17e6616e99dfc2bf61ca7f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a URL that aligns with the observed link farm pattern. This suggests the document is part of a link farm or SEO manipulation scheme, potentially distributing malware or leading to phishing sites.

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://marengineering.net/uploads/1/3/0/6/130620737/130620737.html#conclusiones+de+un+sistema+contable
    • http://whatsappmainonta.com/uploads/1/3/0/3/130313108/278a21e8601842.pdf
    • http://rcctheatre.org/uploads/1/3/0/6/130640079/feziniva.pdf
    • http://thomasdallison.com/uploads/1/3/0/4/130436074/324479.pdf
    • http://katelinmaloney.com/uploads/1/3/0/9/130969532/8366f4be97c.pdf
    • http://www.picturedtolist.com/uploads/1/3/0/6/130605475/zekatogokupup-derosimomuvun-madajotej.pdf
    • http://cloud-token-wallet.com/uploads/1/3/0/7/130775840/xuweregalif-dejanefojore.pdf
    • http://www.empoweringnetwork.org/uploads/1/3/0/8/130874524/6b66d2.pdf
    • http://emotioncodetherapy.com/uploads/1/3/0/6/130621298/jawebebuxuxazojokob.pdf
    • http://www.maid2sparkle.net/uploads/1/3/0/7/130776888/tekopufigekosatedupu.pdf
    • http://mta-sts.mail.dierists.de/uploads/1/3/0/3/130324037/1511591.pdf
    • http://mermaidazora.com/uploads/1/3/0/6/130640145/5511636.pdf
    • http://verticaldetail.com/uploads/1/3/0/7/130739655/mibowurejuje.pdf
    • http://collectxt.com/uploads/1/3/0/7/130775503/d7fcf6.pdf
    • http://mail.cristoenlajuventud.mx/uploads/1/3/0/2/130289738/benuxi.pdf
    • http://livemusicworld.org/uploads/1/3/0/4/130477110/4ae27d9a3ced.pdf
    • http://wingsandpaper.com/uploads/1/3/0/9/130969434/1911195.pdf
    • http://worldofbowcraft.com/uploads/1/3/0/3/130323894/karapagaduz_nobaneken_fiveradumilubus.pdf
    • http://jimstahlart.net/uploads/1/3/0/5/130588230/timipalezo-jeloretejamev-naferobitotik.pdf
    • http://homecare-online.com/uploads/1/3/0/8/130814122/8456707.pdf
    • http://rejuvenatedsoul.com/uploads/1/3/0/3/130313826/fiwapelupijidibu.pdf
    • http://robinosos.com/uploads/1/3/0/7/130739328/buxolisozifegelufowi.pdf
    • http://www.integraltrainingassociates.com/uploads/1/3/0/6/130621675/gezexitibozebuxus.pdf
    • http://psychicmoonreadings.com/uploads/1/3/0/5/130588939/tonuxap-pelozeniworu.pdf
    • http://jsoeudnalgirja.org/uploads/1/3/0/4/130435966/bdaead45defa.pdf
    • http://www.interceptcorp.com/uploads/1/3/0/6/130639223/2446792.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_off00008d50.bin
7671b5a6e1e1c918e45137333dea4a9ead7ea2b7c22bc61ac5b485d1e29eef93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D50 8692 bytes

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