Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa9f41d35814a3d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 11:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13de72ac5ad4c920a0c2e200c577b485 SHA-1: 49e27f22b5e13e42d87c945d76526ed862a4c28a SHA-256: aaa9f41d35814a3df1e1c289b66e614b96c9f15eacd6fcd277e35ec19f7764d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=how+to+import+contacts+to+gmail+from+android PDF link annotation
    • http://www.biosafety.biz/ckfinder/userfiles/files/72231319290.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142423a2ebdb---85297125189.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/sokufuseluweta.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/safigewonufujene.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7eb0d614e---nejosopezenige.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/38593933059.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vujuvavovebuvoxazonosub.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/32346118074.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/fiwitulusarowojina.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/padamopen.pdfIn PDF document text
    • http://dges.in/userfiles/file/zinotudigo.pdfIn PDF document text
    • http://17njl.com/userfiles/files/90080092706.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/lufewareb.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/29771260277.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/49519754400.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/69767729745.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/18894293303.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/dixikifidavakabolagudoza.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///54990816556.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/ravij.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/59881897973.pdfIn PDF document text
    • http://neteyes.eu/editor_up/lijawodupijakabop.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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 17444 bytes
SHA-256: 73c18d1be34b2d35e76ebc7f7f0207a1854211dde56dc278e027974736e5a894
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10908 bytes
SHA-256: af013a92edae848a7d215cfd8c96138e35948a3774aab19a641e5aa25388a28d
font_02_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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