Malicious PDF — malware analysis report

Static analysis result for SHA-256 759222be3dd10a60…

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 10:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5aa302642b22890ca0ab197cb2bc3797 SHA-1: 54c674ef79410199e06544a951cd56be2f1d9867 SHA-256: 759222be3dd10a609813f63b54ac1527f63ad12cd11cfe7c3a5627b4033c459a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=444+meaning+love+relationship PDF link annotation
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vesagafamir.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312e1334390---nebagikaw.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/23389759257.pdfIn PDF document text
    • https://x-software.cz/data/file/movevumuxaxiwubimenen.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wimoduvalive.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tofuxitilikozagodoponeze.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vedelatebabemur.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/fupaxutojasamuvu.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/sovedirapu.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/mozeleto.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/ranodabegi.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/56719861800.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/bezeluzubedufuludowefo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kofilawezunumivexus.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/jodiredikefote.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nejogowomizuposaxe.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/zemegotenijidadegoboxu.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/mixatovus.pdfIn PDF document text
    • http://client.diffuse.info/files/turomoxopomasasagojizejiw.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/nuxafusovitobodifefeb.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051019187757.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/nulumusizezasubak.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mapejusig.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tibusefezomuzinipatesog.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_off0000ba81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA81 10744 bytes
SHA-256: 27b83cfe87dbb939ce35059a2a600f07f51b040994942da99b41d05b6b9f8051
font_01_sfnt_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 16644 bytes
SHA-256: 159d06c2b5bf9f4317807dd99ea97355ce2f7f42b582facd61169b5164c7f0f0