Malicious PDF — malware analysis report

Static analysis result for SHA-256 99590556c3d588c0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 12:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e71a3a07edecb6108f2bcb28e335c2da SHA-1: 5cff86fcb4dfb6afb28fa5b7adc83b272828810b SHA-256: 99590556c3d588c0f00b927d82538d783fbec17706acadf6cfa16252b46e8676
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=animoto+video+maker+android PDF link annotation
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/reranuvoxenepelikadijesu.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wajasapiwujirazawux.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/bisokitonegosatikepigenuw.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/57679857742.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/7388278405.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/82225485860.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677fde1023---25645823737.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/97921679164.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/5582510045.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/46149811134.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/renelisuzon.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/7245059779.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xudajejamoxifinixijuna.pdfIn PDF document text
    • http://ridendo.cz/files/file/lozisajiniwumelojunix.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/xarejodu.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/58361746017.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14908524230.pdfIn PDF document text
    • https://dafelia.com/files/raxosulusabeta.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/48370242010.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/89401317681.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/82672889864.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/52621863710.pdfIn PDF document text
    • http://sdds.be/userfiles/file/lowerevenijikalogofaro.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_off0000c686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC686 17592 bytes
SHA-256: 9849f01caff19918c4db16eebc84e2a6fb0e974a86a3cabf9d0e039c1ac89d29
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 10336 bytes
SHA-256: dc9ffa86deddddde442fcb61638957601dff435f90637b2c640a3fde777f167c
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1