Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab492ea0bb1894b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 21:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10cb154c992c6d27b7821370429dc2ef SHA-1: 070a0ecccd0a04fcbfc4b6ee2d5a9ad788d2c8b6 SHA-256: eab492ea0bb1894b2c9f4890fdb84987b39eb331a2f3bc4ebcedb49bce2591f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a probable attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/46229332942.pdf In PDF document text
    • http://mediedil.eu/userfiles/files/58867028040.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/sorifigakabuvenofe.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/88977594466.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/66932888007.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/pilarovin.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52690ac7---botorinopimovimebofuruzu.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/figipofexanakuwekazimoga.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/vitatoludawuxusumarufuvog.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/23949479992.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/pelokabobo.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/38423005501.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140580412afc---93541042970.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/11918139403.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/62524722772.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907222305.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/62007659864.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/joxuxizepeteza.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/liwakesomalul.pdfIn PDF document text
    • https://mavibusiness.it/file/bodavatixexote.pdfIn PDF document text
    • https://paradigma.bg/uf/file/43837345033.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///12430519916.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/rulutovamugewokeketibud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+mystery+dungeon+gba+downloadPDF link annotation
    • 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_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 19296 bytes
SHA-256: 91bf644dd9ded9b8656f2265473581840b41d98c3c5973891dfbcd513d7eeafa
font_01_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 11032 bytes
SHA-256: 0574e42a9ce7011a59954ba574bb9bcf95a151b0d4b08a6d27c3d8d9db023788
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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