Malicious PDF — malware analysis report

Static analysis result for SHA-256 b815d830c0dbf0d0…

MALICIOUS

PDF

49.2 KB Created: 2020-03-18 03:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dea6f39fb694561badff4d89bc8f7305 SHA-1: 7234ac8b154f5f6eabd59ccd18f51ddfe9e6e7a0 SHA-256: b815d830c0dbf0d0d272136b9d741c2bb96df04a7262ab15136206376e92714b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a significant number of outbound links, suggesting a coordinated effort to host or link to numerous PDF files. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link farming.

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://headblocks.org/uploads/1/3/0/3/130323116/130323116.html#the+iliad+and+the+odyssey+are+greek+brainly
    • http://interpreter-portuguese.com/uploads/1/3/0/7/130738673/5664064.pdf
    • http://nijacode.com/uploads/1/3/0/4/130475932/zuroxidanimesegos.pdf
    • http://newtampafootandankle.net/uploads/1/3/0/2/130289453/b7beaa46e.pdf
    • http://mx.kidskingdom-ellenboro.com/uploads/1/3/0/7/130776017/nofonenidojobupe.pdf
    • http://simonwestlake.com/uploads/1/3/0/6/130639559/nikivi-sabapu.pdf
    • http://ch.panoramiccave.com/uploads/1/3/0/3/130313500/wurunu.pdf
    • http://agririskanalyzer.com/uploads/1/3/0/4/130435582/puziwefiw.pdf
    • http://capehomerepair.com/uploads/1/3/0/6/130621226/e745ca.pdf
    • http://test.campusministry.net/uploads/1/3/0/6/130621905/6456013.pdf
    • http://www.tradelinexpressshopnow.com/uploads/1/3/0/5/130540405/a46e74ab789750d.pdf
    • http://hostmaster.earthcarefarm.com/uploads/1/3/0/5/130550823/resimapikuxag.pdf
    • http://onlocationvacations.net/uploads/1/3/0/5/130540033/126518.pdf
    • http://www.shintoshigreen.com/uploads/1/3/0/7/130776168/503dd4416a.pdf
    • http://iandaforensics.com/uploads/1/3/0/6/130605118/6473105.pdf
    • http://logopraxis-l�beck.de/uploads/1/3/0/8/130813786/33d8d177.pdf
    • http://dennisbanks.us/uploads/1/3/0/3/130323115/5893599.pdf
    • http://consplayers.com/uploads/1/3/0/6/130605299/nifapubajewimi_kijafukeli_gopajegevup.pdf
    • http://gotvapestache.com/uploads/1/3/0/8/130874017/vutijomi.pdf
    • http://www.lilolehardware.com/uploads/1/3/0/8/130813632/dikuxak.pdf
    • http://broadbandaccess.org/uploads/1/3/0/7/130776481/1778947.pdf
    • http://radiomusicsociety.com/uploads/1/3/0/7/130738759/tomemesonowujo.pdf
    • http://salesraider.com/uploads/1/3/0/4/130489240/fenoburepomosavapa.pdf
    • http://www.gregorydwidmer.com/uploads/1/3/1/0/131070688/pigosudozipu.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_off00009abc.bin
56283b052d46902c37638bf901866cbdc04875e24a34425a04913e2900a0e3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABC 7108 bytes

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