Malicious PDF — malware analysis report

Static analysis result for SHA-256 92460a5c8d396e66…

MALICIOUS

PDF

64.1 KB Created: 2020-03-23 16:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d89ef9c0b1c748ca596d8136a107ba5f SHA-1: b7640a1b24011707128214d3733347415549c9ab SHA-256: 92460a5c8d396e66a17167ff7a69e5c80bcb596886560b757c9d554a80a9b1ba
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a link farm or distribution network. No scripts were extracted from this sample, but the sheer volume of external links points towards a malicious intent, likely to redirect users to harmful content or for SEO manipulation.

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://indoorqualityaircody.com/uploads/1/3/0/6/130620613/130620613.html#derechos+de+segunda+generacion+en+el+peru
    • http://ns.newportplusboardriders.com/uploads/1/3/0/7/130740617/e880e2.pdf
    • http://hannispizzeria.com/uploads/1/3/0/8/130874287/4762895.pdf
    • http://orderedelements.com/uploads/1/3/0/4/130489363/zarijukin-reviruravo-nuwosetawugidin.pdf
    • http://www.counselling-galway.com/uploads/1/3/0/2/130271087/zawafinax_dabuzasavixe.pdf
    • http://zerno.tatar/uploads/1/3/0/4/130488875/1072799.pdf
    • http://hostmaster.do-well.co.uk/uploads/1/3/0/6/130621382/kiwomer.pdf
    • http://cleanercooking.com/uploads/1/3/0/5/130543106/vovejuzi-riruso-sukinunovoziki-zozun.pdf
    • http://berryvillebop.net/uploads/1/3/0/9/130969315/wemidus.pdf
    • http://vazglobalproducts.com/uploads/1/3/1/0/131070849/fukumum.pdf
    • http://waelk.net/uploads/1/3/0/5/130551264/malapinafuwewar.pdf
    • http://www.beachshackboutiqueandtanning.com/uploads/1/3/0/6/130604775/wofemapapek.pdf
    • http://eqdkp.org/uploads/1/3/0/4/130483510/8e33203fc.pdf
    • http://fctruckee.com/uploads/1/3/0/7/130740264/6569647.pdf
    • http://taipeiplayswing.com/uploads/1/3/0/7/130739628/mibeduxosonup.pdf
    • http://minimaltees.com/uploads/1/3/0/3/130313632/xixefun_mosalotiwag_tofewamezuz_rezewuvisizaris.pdf
    • http://www.airconditioningguam.com/uploads/1/3/0/7/130738546/9489472.pdf
    • http://hostmaster.nicolettemurin.com/uploads/1/3/0/6/130621620/7005795.pdf
    • http://thepurposeprofessor.com/uploads/1/3/0/3/130379133/nijiwa-wosolunomerin-voxedofivovan-laluzejinireko.pdf
    • http://mta-sts.mail.wedoinsurance.com/uploads/1/3/0/4/130489122/176f1b.pdf
    • http://snowflakechristmastea.com/uploads/1/3/0/6/130639972/e2198.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_off0000cba1.bin
e18201c3a2f4d430e71f8c899bba3e0f88ded252670d8b4464ba7bf0eab71dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 10728 bytes

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