Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e876af13090a94…

MALICIOUS

PDF

93.0 KB Created: 2021-09-17 10:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73737ed123b6ede1050d543e3e43c261 SHA-1: c3a429d76503bd1666e8e347378962de49c1ff9d SHA-256: 45e876af13090a94ea4166a58ee83f7d5343de35353425bd40d46e59b1f172ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting a phishing or spamming operation. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://fullprotec.com/ckfinder/userfiles/files/40871181953.pdf In PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/49940070276.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/4540303181.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/57767971540.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/bovifesinutad.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/177718478.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/46019236259.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_D14D11E4F1A41CE4.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/512d82a72eef17671c9db1e7f727b262/wesileva.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba62cbe2e---favox.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/55924306441.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pikuxafezakutukevaki.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/19759420786.pdfIn PDF document text
    • http://greenglobepms.com/uploads/toraxiro.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/19678476814.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/35226015119.pdfIn PDF document text
    • http://enricobarraco.com/files/15306146121.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/85683559680.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/60446386442.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210911042009.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/ririwirutosuziwejeso.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/poxivaxupefopepawasem.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/92806273699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=new+google+apps+for+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_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10640 bytes
SHA-256: c7373c321f389bb55613e2131fe6f3c628e9d2587debd4e0b5bff689d7090f4e
font_01_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 18872 bytes
SHA-256: a4a2b341c6e1624dee37c0418543adc9d0575737f1860d989e48de8eab4ad111

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