Malicious PDF — malware analysis report

Static analysis result for SHA-256 f839d10927365989…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 11:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c50ec18d40cafa539ed1c28cd9a8ee26 SHA-1: 9a64044c96be89dc6b7d2d2c192eb1e50a21b9e8 SHA-256: f839d109273659890a2d88a2893a3591c7e5fca80be9eb788daedeed518dbc41
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses deceptive language to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=ishq+vishk+full+movie PDF link annotation
    • http://sprinter-lab.ru/content/File/54089115682.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/99197853174.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/tejifamixi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/3448712939.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/genopute.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/86370791677.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/domupoloxozina.pdfIn PDF document text
    • http://chemsdano.com/upload/files/79314324032.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/40385572153.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tesibijevorupojeferogi.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovawijugamob.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/denibafetimuvewegenijibeg.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614025d56d76d---kolikadomaz.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/jabumupa.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/nowegijojojurokutetijamav.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/jalepog.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/neraruboloxodovid.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/nofirajaretulogazetije.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ae2c148349e696105f5ca3882c1111b1/72577038388.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/23266858341.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/41364667616.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/zaxipoto.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/41135023099.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/zonoluputezaj.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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10368 bytes
SHA-256: e002542bb858137e9c7f0cb62e41916aeb9db30888e879577fa708d11b86a919
font_02_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 18404 bytes
SHA-256: b1ee044e86a8e3b040d8aea26764c0967c9ea16cd94eb56e096111f213b7fde5