Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7ebbd4cb8e8023…

MALICIOUS

PDF

79.4 KB Created: 2021-10-12 15:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8558f3649034dccb41c50fd9e06d2f4 SHA-1: 84571062f44a39f274eda4ca253c58bb1ac25298 SHA-256: ca7ebbd4cb8e802312bfab7d56d81f741096beeb369a5cba2b9b8cb390a0ff89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to potentially malicious content, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of linking to many distinct, disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an intent to redirect the user to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wixoon.hu/upload/file/jemutakikapamomujev.pdf In PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/83925458973.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/7586296293.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dibimilopezelitu.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/kuzenutudi.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/sovivipiwurenaponakuwos.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7dc4d510---jaxaz.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/dumosofaleduget.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tupebupimovakube.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/3986571903.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/16763394655.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/sutirivizabimekeva.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-10-7/20211007202057626752.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409bdcad69d---jikizemit.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/xoxedatawinedufiti.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/29051096847.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/96205094227.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/dofujijo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pisovukiran.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/88046229617.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/55183176625.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/goxiwuvi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=karate+kid+soap2dayPDF 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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 18572 bytes
SHA-256: ef77b9071404689d0b824c6e26841fb8813bf2ef1731b33adcb07bed87bbfef1
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 10552 bytes
SHA-256: 78bc893d8c95b509e9ad0c9c4bc130a84a162cf3cd8e07bf112c881b74a57abd