Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7c4c638d008d68…

MALICIOUS

PDF

73.9 KB Created: 2021-09-30 11:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f442f06e37ff7174840e0664fefa56c9 SHA-1: 7d18f9eb33214ecf6fc09de567a3f72e46e6e5bc SHA-256: cb7c4c638d008d68a41573aed23c4429b1778658ad107b3e5c4f435ad4bb172d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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=clash+of+clans+unlimited+coins+and+gems+hack PDF link annotation
    • https://www.comperat-89.fr/ckfinder/userfiles/files/12555199745.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/pobotix.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/37815427077.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109221605263941.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/66267830977.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9e01fc4bd1ac07463319c48c9e694405/samerufikakobezesan.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/59796760432.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/22600175632.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/gikabajakivazaxo.pdfIn PDF document text
    • https://grouptm2.com/contents/files/59774041625.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/761727175.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20210921_201437.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/77095461539.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/3475470906.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/zelor.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece90c208d---loxufogitivi.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/folitulegelijowirade.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/tonosama.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/96925948130.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/tawisomajikopubadovonaxi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/24372331877.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/gebososo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuvuzat.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/telemuxipikib.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiruzuzebupetafujaxabidab.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_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 18512 bytes
SHA-256: 66351debb3a55c654bc1b4cd3ad4549f32135ad2e431928bcdaaf6ca489dc35d
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 11044 bytes
SHA-256: 69a0ada5e4895006fe546ed0fbd0f934bcc244a70fa1701a0da33ad6cb37ff65

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