Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d46db142619dd7…

MALICIOUS

PDF

75.8 KB Created: 2021-11-11 23:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e2275639ce1e33528141973586c4e60 SHA-1: 0facba9109f1e313a3555123d0207b697520e855 SHA-256: e9d46db142619dd7766c60db2a860ea8ee76b7e704e0c35ec7c7d15de721c4d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and its function as a link farm suggest it is designed to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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 http://umrllc.com/userfiles/files/50907756952.pdf In PDF document text
    • http://gianniarnaudo.com/userfiles/files/3465107242.pdfIn PDF document text
    • http://kolesa.sk/files/35286926712.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/793467c0149155618d79d5fa8a3e2986/noxuwi.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jawelamafufotewipobo.pdfIn PDF document text
    • https://dom-titan.rs/files/72868207663.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-10-18/20211018075154197008.pdfIn PDF document text
    • http://bresky.cz/res/file/fomegesi.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xogatufedabojufewu.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/rajaxugejigiparabi.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/ZQ4jP3q3huEoCIo5.pdfIn PDF document text
    • http://ipublicity.cz/data/file/tijeza.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/81201487710.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/29860785173.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/xetowur.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/koxikoketirivezobetepe.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109100603377733.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4115b7802---mebudanajovukifigex.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/kevikujematetufodu.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/65352443160.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/legevi.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/37614833574.pdfIn PDF document text
    • https://arerp.kr/data/file///27986375043.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/zulusisurumijozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=rdr2+cheat+codesPDF 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_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 17396 bytes
SHA-256: 41ecae818d2e6c31154074a830208b38facd175e50b2ca87d5f10dc78b58c297
font_01_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 10388 bytes
SHA-256: 77dc616ab4c5d93c0988d9aa8369740620cfc7dc8b8188df14ba127dd03088f2

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