Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec9b603f575fa11…

MALICIOUS

PDF

69.4 KB Created: 2021-09-21 03:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4ca2d949baf99f27f5929d8651ada8c8 SHA-1: 550f984cd6bcfc398116b96b1dabd27cdb9f38cb SHA-256: dec9b603f575fa1163f13825ed4d51bb2da9a0898f7bf2380b76893b8b61c1c9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to either phish for information or download a secondary payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=w+and+j+words PDF link annotation
    • http://chinawin-consult.com/userfiles/86441976378.pdfIn PDF document text
    • http://labradory.pl/file/dujeb.pdfIn PDF document text
    • http://446888.top/userfiles/file/zutidupo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e19e4b18766cda03bdcabcf8c2d68b8c/rovumamunukimimo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/61775714060.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/rekuwozoxupebit.pdfIn PDF document text
    • http://trieuduong.com/images/Download/81298736006.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/23681660554.pdfIn PDF document text
    • https://yasacompany.com/upload/files/pogotenigadikanevibewux.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/xulefaxudidigeje.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/48176872992.pdfIn PDF document text
    • https://flomogroup.com/upload/files/ratojedazutufekasikiro.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210921031826.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4f9dc1be5ef6b8a280fa914b4db86581/45259584257.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/ribuberagiwaxaxagutu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/85029480106.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/97629542974.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vavorewirikizafokoxi.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/biguwukokatubi.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/97974054189.pdfIn PDF document text
    • http://contextuae.com/resimler/files/44464392487.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vafopolivegokila.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_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 10080 bytes
SHA-256: f87966e9b4c13740785b9be728176e7fd209fcb35b61373647f472d81e5f635c
font_01_sfnt_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 15480 bytes
SHA-256: 6604f6059f3255a80a9c2ff8f91c1a424033c3bbf956e00c6b15bdf459a11a62
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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