Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f8d7aa7e0a4779…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 11:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc9ad47f4c44dd93d634de58130610b6 SHA-1: 7261309f33631ecb72303f4b9838d12dbd404c53 SHA-256: e1f8d7aa7e0a47792a91bea2dba9a2a629260ab11bd4272c5dbbcc7508af2194
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the link farm pattern strongly suggest it's used for phishing or malware distribution, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ducthanggroup.com/webroot/img/files/tuwera.pdf In PDF document text
    • http://sattosushi.com/uploads/files/juzisinesiduxor.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/femipelimazelosedaxawoke.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/52914797732.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/71800826135.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/43288670415.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/71911316323.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/20221087063.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/23829557920.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zesavimaxupadujaj.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/4240030003.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/49203173716.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902083617.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/85920487532.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/77731945223.pdfIn PDF document text
    • http://trovas.com/userimages/tofopebijeso.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/27632888990.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/73826298938.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/56697082623.pdfIn PDF document text
    • http://precisao.net/files/files/figuliguzijivefixu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/pinorawedonupazojitiw.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/gematu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bikini+avengers+movie+watchPDF 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_off0000ab64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37B 10928 bytes
SHA-256: 8e353b0130cd565cabfaa0e0af14006c50fcb42148ce1ce2a515f77fe1ef7f3b
font_02_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 14720 bytes
SHA-256: b83f3c03bfe88d4271a0261889183e46553ed6bd7070802981018bbf4d229fe4

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