Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aaac7b58acae289…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 22:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b16ded72455f983ed30e08364f6ac793 SHA-1: 5a584590bd8f95745bf3e8e21ac9130ad34c03c7 SHA-256: 2aaac7b58acae2891f35fee9eef04cf04d2e8ecc66d4ebd8bd0880ee7e0bdc66
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=jungle+book+characters+movie PDF link annotation
    • https://learn-atdi.com/uploads/files/44257085250.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/66842211542.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/sotavilosonusaki.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/16875962602.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zarafepikawuvufidunozun.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/maponosolotomok.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/62679035609.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/22558351685.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/molowugu.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/xowowirarelonetatu.pdfIn PDF document text
    • https://demowz.reikor.com/webimages/files/piwesuzeluka.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/79238377501.pdfIn PDF document text
    • http://totoumi.jp/upload/file/88799798734.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/75153559687.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vaguzubaw.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xokirozefomozune.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/42079458831.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/togikimem.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/46951816061.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/78298867916.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/95745325587.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911033144963986.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/41723859422.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138468894df5---filijefutubedogekud.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/31381756832.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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 11068 bytes
SHA-256: 9d9241c39fabf75cbe264b67c0cea58c2f43e2917a86f12c9e4a4bdd77852967
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 18300 bytes
SHA-256: 4bb7c1ade05e8fd0e64002b5753aade3bbf34b6bc4848b5e47fc91e8e6c08ce0

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