Malicious PDF — malware analysis report

Static analysis result for SHA-256 375699d6d940cdd1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 18:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: adb4d8a6f3c6869af208f0d6676d3e9c SHA-1: d1797191f7181389609e08d808ac819ed3695166 SHA-256: 375699d6d940cdd10e3255c7cdc865a42e094c4e5340af6ab8e25aef9bb7536c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

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://synerhu.ru/uplcv?utm_term=slow+motion+video+fx+app PDF link annotation
    • http://ilkemymm.com/image/files/35301205396.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/lireg.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/46307968053.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mojotadexibor.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/17646796308.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/viwaz.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/jivun.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/67213126224.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/migatazotojagab.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/xugapoviwadirifarexaviz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136373cdcffe---ferobilimamu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/86253905714.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/29765060522.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/zopofapu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/24063125809.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/38240072477.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/52004347553.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tuwenawesuli.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/fadekikusarovubo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/50457540246.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/lapuvowimigidowadulupe.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/mepifi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210905_029D83CB600395F7.pdfIn PDF document text
    • http://bamor.org/userfiles/file/rerofalibinelipowazutip.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/25393423224.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_off0000be60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE60 16372 bytes
SHA-256: dc4c9dce61ab7e156177173764659a4f95ead9495c387fe4433279827494e964
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10720 bytes
SHA-256: 8abd1c92c72b325133d3df25cec2262517108731ed51dcfbd6137e563a65c6af

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