Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d4cf3bb9291edc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 06:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b696ea6ea48c1a72256542d609dc8b7 SHA-1: d97c99bc08ab9dc6ae7f713cdb951f673db74486 SHA-256: c9d4cf3bb9291edcb3acac2bbbce2d179252180e9765b8d6ed92e7ce0c9340c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous embedded URLs found in the document, some of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=thinking+out+loud+mp3+download+mr+jatt PDF link annotation
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901055411457530.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/47012942168.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/bixez.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/zuzulelijofa.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/79066424977.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/delawijavajaregilurez.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/wilinono.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/24106077323.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/26966154069.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/38862235470.pdfIn PDF document text
    • http://ilkemymm.com/image/files/savaparomope.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/fojejozudidimopul.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wosid.pdfIn PDF document text
    • https://taperagi.com/contents/files/91481877463.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/41704334647.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/79553591845.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/2089207048.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/22893316855.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/14336823133.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/46501519156.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310de994798---wofolowat.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/9288799828.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/rikuneverebutenaba.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 19452 bytes
SHA-256: 4978eba4b517dee3f258d0e471198573c94e8510666f2ba61656e0187eea86ba
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 11084 bytes
SHA-256: 88dddd0b79e322628bdcc9154fea727fc8c4025c39863fc92bb476e4620242bd

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