Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bf1b6e9a0ac2b4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 23:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bfb283fa39ed3bd19cb2862193225fd SHA-1: fd3bbe40083b8a8327cca48dac9516bf427902ed SHA-256: d3bf1b6e9a0ac2b437355d19a2a63b78f60b4d7dc91a7add35e82b40c770c594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to PDF files on disposable or unknown domains, characteristic of a link farm used for distributing malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links. No scripts were extracted, but the overall structure and URL distribution suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inprovitperu.com/ckfinder/userfiles/files/bepomigeviroxur.pdf In PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72346273909.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/85937898424.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/milebuxubitetep.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613681ebca514---gafapujokawavarefepemomip.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/34176695303.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/tajonovokip.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tazinefawenefor.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/34379158401.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/faxapeterixadimepaw.pdfIn PDF document text
    • http://ukrfirework.com/images/file/pubomik.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/33064319774.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/japunavusojibizobaki.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/vupatipepojalivifuze.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/88695736739.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fikuborukisavotawinusuka.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/60960035011.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/84693014748.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/xugirelirogojoleg.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/mezozegoxemadef.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084ff745c1---rekipubetebivivorafi.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/duzirobanuxonunipuwejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+turn+off+apps+running+in+backgroundPDF 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_off0000b4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D5 10932 bytes
SHA-256: 810b85d6cd3bebccf00d2c7c9f391caf4e4e10ee5f5e9e666c7bddcfe3ef40a6
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 14912 bytes
SHA-256: 7be3113e4980c27a010b5d4ad4c027406135b6360e88f797a077110502dcbc98
font_02_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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