Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f265963b92cb0c3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 16:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d319ee29f8f28779da90e385caa9218c SHA-1: 8f281de5c927a57e334bb59cc914dc6f30fdaa5c SHA-256: 2f265963b92cb0c3838b9a2b182f95a44dcee70a32fa0c195189c46054d87e2f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=fem+harry+potter+x+james+potter+time+travel+fanfiction PDF link annotation
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/90341356861.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/63716164919.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/gigojanelod.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/49897667861.pdfIn PDF document text
    • https://ultralloy.net/upload/files/78851067976.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/88396274130.pdfIn PDF document text
    • https://designclarf.it/file/dinavodi.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/91235510012.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/gibituwegigego.pdfIn PDF document text
    • https://windsbs.biz/files/file/puludebetitoretiba.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/85431360380.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/nosiverumotadu.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/24647935630.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/89677839724.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/gifuvopedazar.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/netodikib.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/jatogopunaza.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/17727329140.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/72147687087.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/bemijowamikigafe.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/gunupolaxap.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/ririkofurobipiwexagun.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///jojenedujuvixu.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/lugegotazunidar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 11132 bytes
SHA-256: 56547b551adcad1bcb41520b7847fa95147af38ea3d2d46e019d5bcec173fa3e
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 17892 bytes
SHA-256: 1e20c1080ca33e41899d845ce9844ba7b0568c905857d47bf7fad22b174bd126

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