Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c06a5cfb639e6a…

MALICIOUS

PDF

78.0 KB Created: 2021-10-10 22:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 634b5a03c131ab3334cfc0b15d918b85 SHA-1: 7d82fe52148c6bacd2a889a929d53e0187c1ed6a SHA-256: c7c06a5cfb639e6ab1c68a3d6b9e9815be476298f1f59974ca3165ea4ce39a39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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=synonyms+of+thanks PDF link annotation
    • http://hotelniagararimini.eu/userfiles/files/kexalolebebumawapufuxop.pdfIn PDF document text
    • https://petikdaun.com/contents/files/joduximuxelozarugi.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/molupawitesuwifiva.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/zadefoletinokepugijot.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/kodixoxafetu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56771223753.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/nanivijobinelupi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cicjnsdr95hnamg20lbp2rn0ho/deduzolaka.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3c023fdf7---jusuvuzefo.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/demiwafapelare.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/29172542744.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/fizosoxirokobekukegawaj.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/todok.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/68201822995.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/48448853573.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/lupefidunakisakerawatig.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/11716450902.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/29128124371.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_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 10388 bytes
SHA-256: 7295964791462ae33f1e27f1ce20e7350d29a9a86f7e0d54d1035202b2baba59
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 17584 bytes
SHA-256: 0361e38da12c30ce85b83c89c9903b626c08224aec54f76999ef0f36d7df41bf

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