Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c351854e591350…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e21bf112e1946d699828d2d3401a6d8d SHA-1: cfbc2edda38a67f95397cafc63b27416b8725fb7 SHA-256: 99c351854e591350cf6ec4992d993d6bd45050ff6799a9fe82018ef1a700d6ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The presence of these links and the overall structure suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hiroshima-teishaku.com/userfiles/file/34537557649.pdf In PDF document text
    • http://silver1979.com/upload/file/22084886368.pdfIn PDF document text
    • http://keacg.com/upload/files/25071492451.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0fa1b885---meberidesewedeleragas.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zidiramorerokaxes.pdfIn PDF document text
    • https://sitarasign.ir/data/file/najivapoletazig.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a32dfc34f25190eb049b388d927ca5e1/bagogewezilori.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/kubumevedadinuwugilozid.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dipawidifuj.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/90070317597.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zupodepubewototejurobed.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/46530326549.pdfIn PDF document text
    • http://nprofit.hk/userfiles/95338858166.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/69651775119.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/20408189171.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/43319355720.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/xajiburunij.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/palalamadawuvovofowupido.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/rimepekigofuvufobawulag.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210916165533.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///guforal.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/wixuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bioblade+mm2+valuePDF 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_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 17368 bytes
SHA-256: 81617283aab6712d970f31edf9af5a5ff5d6c3654bbb439de1563b2724c0fa4d
font_02_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 10420 bytes
SHA-256: d08c0ec500161083ecb8ba7f1148f25dbe3811e85b852a511b6350d873bf2fb5

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