Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd0f4cab6426b83…

MALICIOUS

PDF

72.3 KB Created: 2021-10-01 14:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f64dae110c5c67c33b1a4f0c430b7417 SHA-1: 196cdc27af2c4b9003550348befe78ad4218737d SHA-256: 4bd0f4cab6426b83483f9323a0798683bcbbf6cc3e15781a1e7a9c0c4220a427
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also includes numerous external URIs, many of which are part of a link farm, suggesting a phishing or redirection scheme to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kfmaccounting.com/webroot/img/content/files/mowolazaxiwaxuj.pdf In PDF document text
    • http://studiophotosfashion.it/userfiles/files/kexifikam.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/25294060590.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/lepikisazuxebafajikosuke.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/9236064881.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89831141---95152284617.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/21649359730.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210925_751959F7E1332012.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63364378932.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/mimigosimofudipenadipow.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/46908797041.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/42333321024.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/44646508919.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/49767358711.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/60495590848.pdfIn PDF document text
    • https://reha.bg/content/upload/file/85392358017.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/25280359732.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/32035718603.pdfIn PDF document text
    • https://novsport.com/content/File/89673614876.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/49795907088.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/durifadidegomegexoxar.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/metafovop.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/wumonexuponi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=123movies+the+quiet+placePDF 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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 17880 bytes
SHA-256: 773c35e5427dc9abc4989eec57ea2d11228a9b801640908d6f3a4e9599d26a31
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 10992 bytes
SHA-256: 301b9c433d8627f876a7e98f7afcdb210c17e547c010400fe86c089e821e3e78

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