Malicious PDF — malware analysis report

Static analysis result for SHA-256 7683c6e337b002f0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 619e70ceb841988762acbb2542e59792 SHA-1: 302095bd9b0569a97fa3810f928b814fb02833b7 SHA-256: 7683c6e337b002f03bbc7f536528ea8d74da53b223d89afddf0c505ff8d76ce9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these external URLs, which are designed to lure users into downloading further malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=harry+potter+and+the+goblet+of+fire+movies123 PDF link annotation
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/66421396916.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/soxesesinugevag.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/35180290373.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/zaram.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/34120098148.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/89518886061.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133210779202---31124556100.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nawidewagiridurakaxovul.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/12838948259.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/xiruximobus.pdfIn PDF document text
    • http://bscartridge.com/pic/vizudabepoxanebe.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/83240684619.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/xobibejimotasomulotuv.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/76352285364.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lebebugekiga.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/4314999586.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/83692973944.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/sirurusebed.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/94093361663.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/34285864213.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/78234054773.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/lisimuw.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/31305116522.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/labupigijegepunowebebumuv.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139632a9a2ef---maxopuzuleze.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/jonapisidewutamipif.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_off0000c65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65F 17892 bytes
SHA-256: f687376b95f61b4be54a38491897c0949624b1f9110448ba7e01fd5dd6e588cb
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 11600 bytes
SHA-256: 0eb0fa29fb5f22e9303c0a9144e4066415726a1315650fd6141019105521d89b