Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d6e3ebaf44fae1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 18:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4291157b1d875ec062c9ff9235f8a73b SHA-1: 2ca41826e0717d902bf7ea0abc1bfc7c8b6d4944 SHA-256: a3d6e3ebaf44fae1684166a084c456fae4afcbcbf367badeea08f8b5b1ed31cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bluza-shop.ru/content/File/54479117405.pdf In PDF document text
    • http://noithatachau.vn/webroot/img/files/84287963925.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/tukabe.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/49416176911.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vowopatit.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/99903868954.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/17617122858.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/75576724171.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210911_F42B7378A5A92274.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/71281464198.pdfIn PDF document text
    • http://scantech3d.com/files/rivolex.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/zorajokumokarewipuda.pdfIn PDF document text
    • https://parc-hotel.info/file/97410049254.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/dodekefujidozawasugab.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/14214581526.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/79084688526.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/8389300196.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/judejakizimesulanub.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/sebiw.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/36142381789.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/kafezunotaxubaxovuvun.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/22517014873.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6654624a---pezasosamibagixo.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/69849693757.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501360cd6f2---wekufijo.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/69980341450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apps+for+reading+books+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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 10744 bytes
SHA-256: adbf16cadf0da3502433bab62e98eb141149068eb61a5b44e53221b32d151d05
font_01_sfnt_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 14500 bytes
SHA-256: 35e530339cc9385a877935884410690e7905c66bded82381ad3872167879db50
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1