Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918e02dca23a337…

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db264007a829778e35bdce6c8c2fd26 SHA-1: c92460295091bed4e1d7c202cb010ea10870d324 SHA-256: 8918e02dca23a337f5c4b663c4acb0e6b7b9774af438fb56fde6b6957d5b3759
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dom-2000.ru/ckfinder/userfiles/files/81209998720.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10956bff84d96f6f2155134eba2e7001/90602842335.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xevagifedemenubata.pdf
    • http://intelekt.biz/uploads/pages/files/6437516380.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fadub.pdf
    • http://idcla.net/upload/files/muriw.pdf
    • http://dulichtantai.com/files/uploaded/files/jojupozokipumi.pdf
    • http://ibshop.gr/uploads/_uploads/files/kanom.pdf
    • http://quaisetoiles.fr/img_pages/file/4607372757.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/23040503181.pdf
    • https://rugsinc.in/UserFiles/files/ximubitivib.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vepisetekazorowil.pdf
    • https://aljazeerahdrilling.com/userfiles/files/50998540855.pdf
    • http://koyomisushi.com/uploads/files/41653364884.pdf
    • http://www.moyekolodin.com/files/vawezafoperujaka.pdf
    • http://nsfeed.com/_UploadFile/Images/file/29563555749.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sorix.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/68396116288.pdf
    • https://petikdaun.com/contents/files/panalovi.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/kuzubovawozemu.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2c6mb3abgh917tideksft23rgo/lajuwafifugajeno.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/jutawefexeka.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/dawisunaxususurusujifep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=football+stream+free+websites
    • http://perfecturology.cafe24.com/upload/editor/imagefile/31865531161.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 16792 bytes
font_01_sfnt_off0000cd4e.bin
b472babe0d3ae3171156f9fb3dc7bc7f9e42408742a5c8dbc5004273493f6932
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 10472 bytes
font_02_sfnt_off0000e539.bin
0803745417bd8a27cabc8ad94418c58c45e48f417e63921a9c6dfe655f4545c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 15136 bytes