Malicious PDF — malware analysis report

Static analysis result for SHA-256 087e2123a443a343…

MALICIOUS

PDF

38.8 KB Created: 2020-03-28 04:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c14630beac2fecdcf1392b33c095dc1c SHA-1: 489af6b365364d539873ed8bb34f007ab9a3b68c SHA-256: 087e2123a443a3432921a2fbe4a8373ee67f1fcb7c8aa37a3d72b81d292f0fd2
136 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious SEO link farm, embedding numerous external links to PDF files hosted on various domains. The ML classifier strongly flagged this sample as malicious, and the presence of a 'Password-protected archive handoff' heuristic suggests an attempt to conceal a malicious payload. The embedded URLs likely serve as a distribution mechanism for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seasidescrolls.com/uploads/1/3/1/3/131378991/131378991.html#convertir+fracciones+impropias+a+numeros+mixtos+ejercicios
    • http://gausedcarstore.com/uploads/1/3/0/7/130739492/xeledu_rujatatisolibu_felezuvemiz.pdf
    • http://www.justinebainbridge.co.uk/uploads/1/3/0/2/130270911/1857352.pdf
    • http://limoservice247.com/uploads/1/3/0/3/130324418/c64a5.pdf
    • http://rockssanddirt.com/uploads/1/3/1/1/131164386/gazarovebuxavo_pogodixudifega_jobajora_rinibeva.pdf
    • http://robertion.com/uploads/1/3/0/6/130620957/2612158.pdf
    • http://mail.maplegrovenh.com/uploads/1/3/0/3/130379163/4592372.pdf
    • http://tinsleyco.shop/uploads/1/3/0/2/130272631/losigas.pdf
    • http://glamycam.com/uploads/1/3/0/6/130604248/lavunokamuzaf.pdf
    • http://help.eteamz.com/uploads/1/3/0/4/130483956/367536.pdf
    • http://toutpartdesoi.com/uploads/1/3/0/7/130776695/1415450.pdf
    • http://webmail.paintedtabledesigns.com/uploads/1/3/0/6/130621142/e8f5bc8f8085.pdf
    • http://maenad-films.com/uploads/1/3/0/4/130476004/gilixivuzadi_luzarodu.pdf
    • http://makico.org/uploads/1/3/0/8/130813797/1378211.pdf
    • http://fashionthinkers.com/uploads/1/3/0/5/130547999/5864949.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_off00006c23.bin
6f34e46f7bb9ab5ae9c65784da2f8889f6fd3f19749bb85e71c0f30aa9b1eb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C23 8808 bytes

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