Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8a35572a7da4f9…

MALICIOUS

PDF

40.3 KB Created: 2020-03-09 04:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e06a3039b75f0ea1d98f532ff3698a39 SHA-1: d1d6f15e121cbfb6cf56d7f7e6b3184daec90908 SHA-256: de8a35572a7da4f9150675336f33318e78a3a3ad28321d9caf8fc1e3937ca782
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links is highly suspicious.

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://www.craftyourvoice.com/uploads/1/3/0/5/130588244/130588244.html#adda+monthly+current+affairs+october+2018
    • http://hostmaster.festivalofideas.com.au/uploads/1/3/0/5/130539316/xefesawumuzavi.pdf
    • http://creativemindsa2z.shop/uploads/1/3/0/6/130620532/kumawifetikapisox.pdf
    • http://nachomamasbedandsnack.com/uploads/1/3/0/7/130739994/7af2a561.pdf
    • http://millermediafilms.com/uploads/1/3/0/6/130620885/131878b14bca1.pdf
    • http://catelecommunications.co.uk/uploads/1/3/0/5/130589401/1559780.pdf
    • http://gcpremajor.org/uploads/1/3/0/5/130589145/7032893.pdf
    • http://www.mcpughconsultingllc.com/uploads/1/3/0/2/130289467/bda994a9ebd.pdf
    • http://naturebringsmepancackes.com/uploads/1/3/0/6/130621165/5265921.pdf
    • http://loganfairfaxlaw.com/uploads/1/3/0/2/130289629/bigedozalibagig.pdf
    • http://friendsofnorthshorefd.org/uploads/1/3/0/7/130776040/milipara.pdf
    • http://www.thisonesforthemamas.com/uploads/1/3/0/4/130476496/jolabasivu_muzawek_xarovafok_kidipogi.pdf
    • http://www.flavorstw.com/uploads/1/3/0/9/130969191/9335053.pdf
    • http://dentalmesaaz.com/uploads/1/3/0/6/130604606/ruluv.pdf
    • http://www.lopezsmith.co/uploads/1/3/0/3/130324044/6557411.pdf
    • http://shaynamade.org/uploads/1/3/0/8/130814900/d4c2e2fcb3d65b.pdf
    • http://www.maralindbergh.com/uploads/1/3/0/6/130603807/6204102.pdf
    • http://nigella--sativa.com/uploads/1/3/0/5/130541765/mijat-tigowesisini.pdf
    • http://harborlightstemple.org/uploads/1/3/0/7/130776511/zuxifenizuver_vijapebodu_lefavugejazineb.pdf
    • http://physicianmummyuk.com/uploads/1/3/0/4/130477192/c5520f0198cc.pdf
    • http://businessbs.net/uploads/1/3/0/4/130435960/saxavepile.pdf
    • http://thelegalmastermind.com/uploads/1/3/0/3/130313314/848197.pdf
    • http://rhsimb.org/uploads/1/3/0/5/130551066/gelaxavepapipam.pdf
    • http://h8terade.com/uploads/1/3/0/7/130776083/sozon.pdf
    • https://www.freshersli
    • 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_off0000749d.bin
d9c55adf2ad37172e9a68ce916ba12451d04632f9ead097461061000bc2724e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749D 8056 bytes

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