Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb38308b06399c4…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e669e52d15ba823594a462144344501d SHA-1: 8abce21feff451cacf7625d15c77bae998940ead SHA-256: 9bb38308b06399c4e140a8fd599f54b40ff52bb0823e8a34969e1df073dc6d31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting, designed to redirect users to potentially harmful content.

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://catamma.ru/uplcv?utm_term=dual+boot+mac+m1 PDF link annotation
    • http://mega-treid.com/userfiles/files/lesazipoziniregosejipipew.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/jarokiganib.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jewizavap.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/29499075926.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jevuzidolo.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/fuwipogidewasatexened.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/5241250427.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/sepevogerusidetewex.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/pogupejezapoziw.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xepusoromipufiripozemafub.pdfIn PDF document text
    • http://master-vin.ru/files/file/zajexad.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/vewofipiwuxaradobavevil.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/xapedolu.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210918185823.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/gitabokeleguximudusanuper.pdfIn PDF document text
    • https://chptravel.ir/data/file/96701932017.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72fb386f877ab06658d81e009faa2a93/zatosimon.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/xofuwalemezadugeni.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/suwetezup.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/37635980918.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/kadipizumupulonurowirel.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/dikirolepemawixime.pdfIn PDF document text
    • https://12shio3.com/contents/files/mevikidona.pdfIn PDF document text
    • http://pmke.cz/pictures/files/fafogasuteruviziniwivo.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/kuvelikusapofawavaxire.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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 10088 bytes
SHA-256: a663bca7163685c6bc40d03ac62b2363797d15338e12bb081315d527a7ea2738
font_02_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 15508 bytes
SHA-256: 6ab33dc04724966aafe939d5e51f4b97139851407ba07007bbcceef24e2f2ccc