Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a5e8d9528b3f5b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 04:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42fe1bf1869bc5e5f9b1d348f37ab9e3 SHA-1: b583193992a91c222183779d896ce0a13758f56a SHA-256: a0a5e8d9528b3f5b389d04bf884a884b6bdb37d42c1a6fc5b2af6d0cf3dcdfca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to PDF files on disposable hosts, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ww150005.linebot.net/upfile/files/20210906030946.pdf In PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210907_E7B57A2A0E8564EC.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/fubinumag.pdfIn PDF document text
    • http://thevalleytrader.com/files/nenazazunemureburod.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/11469401392.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/14810819539.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/31725064912.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/zosafadines.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/67608556367.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xevixukovojivovenij.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/81900357223.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/75303494680.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wunel.pdfIn PDF document text
    • http://lejonhund.com/upload/69584886200.pdfIn PDF document text
    • http://sb-78.ru/files/file/tojajuwiwikem.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/47637062824.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/86996512827.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/72205010522.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/60396649218.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8fe1e440---munogegisox.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/56433040712.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/56152729459.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/waxazufawinusop.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bilaler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+close+window+on+android+phonePDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 17732 bytes
SHA-256: bb9a4bce2a3fbbc1bfb3d4b012b30e312b1e901002ac604e6bd127f82654acb4
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 10688 bytes
SHA-256: c287e1f8785eb3432bb2c2deaac46a0594ef943d1c9886cd155c46602d8c7b30

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