Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f5fd1c69f5a3ca…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 03:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d00a72fcfcb5407eb6153329a04d4ea SHA-1: 7838cb03fb6912ad5946d9dde8f7ca3fc2ca00c9 SHA-256: 95f5fd1c69f5a3caa82d3cb936490f70f02a2c9b481a41b6bb15b5e8c01c8ff8
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. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://music-saikung.com/ckfinder/userfiles/files/68878743411.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/2021981215143339.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/22459434734.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/13871740653.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/31298914385.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/11728502407.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a00da110---55941155467.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa68dd483---13258005329.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/galusidap.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/97978140502.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/20216202483.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/11020650657.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/75982191813.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/dibezuzisowosedekutedin.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/58242429734.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/16888527084.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/mexomumusabakaxi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/juvazimebupikelowe.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/velaminurok.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/98880798372.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/94768188281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=aliens+vs+humans+androidPDF link annotation
    • 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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 10564 bytes
SHA-256: ec23e5bf4f1874606e554041b94df8ea9a29d7b67ed9103938722081a1e3b3a2
font_02_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16600 bytes
SHA-256: 406ec54c7aebc6aff67465d22cdbfde538f20efe9960c8e13dfbea3c7d4e02d5

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