Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347f83254c67cd3…

MALICIOUS

PDF

75.1 KB Created: 2021-10-03 05:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46ec20a3788f268fcfcadb04489c2665 SHA-1: d2b8f3bc00afd600a2499745a1c44417883e8d89 SHA-256: 8347f83254c67cd33044f289d727ccf75b731fa3c35f506ba600df8093ae7b41
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of these links being used for malicious purposes, such as phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tutaylamhet.com/storage/ckfinder/files/71161808124.pdf In PDF document text
    • http://parquet-cortes.fr/data/Files/kogedepajitolosujibewon.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/wezafixuwunifibexumej.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/68111845528.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4a3c20d0---jawezib.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/loxelezazobenawagi.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/39468497738.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353af4888b3.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/74332794593.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/2667755502.pdfIn PDF document text
    • https://alev.az/userfiles/file/zaxexazovenosi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ledudos.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/43022390883.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/93923363211.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109090317436352.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/91010531840.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lusug.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/20529436856131440853ec7.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/tixexeleduwulufizofugine.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/88405199379.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/83519345789.pdfIn PDF document text
    • https://ibextrail.com/editor-images/mekirepedefodedabenilu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/78495308599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chapter+4+quotes+lord+of+the+fliesPDF 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_off0000bbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 19356 bytes
SHA-256: 9538130bd2f5acc6fd627e6551671da7ebe4fde29e5daadc35e05ac69e1d17af
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 10848 bytes
SHA-256: f5665c126d34e1c3a146ad8a9243377ff3ad50fb40f9636cbaae81e78fa6cf5e
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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