Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d5130d495f0306…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 12:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0c0c5226c2f0e490108131b50a9ec154 SHA-1: 0c77eb678a4ccfc30e5c038ca4d33fb088a8162a SHA-256: b3d5130d495f03069363ed0498fa123aaa92e143be09868850027414df668471
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm or redirector. The presence of numerous unique domains hosting PDF files suggests an attempt to obscure the ultimate destination, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://go-pxl.com/uploads/files/7900269726.pdf In PDF document text
    • http://rkmaster.ru/uploads/files/17379436536.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/64985109333.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/vosalelowutederuxexuvuba.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tufulonizekupo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/mutipepekerukemu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xulevixokatebofojexifaj.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910002108.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/49671063077.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/28666863199.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/66062328130.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/51583285048.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/kuxodedilav.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/37162864426.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/varoxal.pdfIn PDF document text
    • http://alkanboya.com/files/file///satumokate.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b129af13634153845551d21bdb8e039f/99759602933.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wotalal.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be546e7f32---gularozonetemijaxiw.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/6169379646.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/kiwekafojugelizowumupi.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/pedozexorimivunikazokodot.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/79394404645.pdfIn PDF document text
    • https://nevisnews.com/userfiles/14776414210.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/14555611475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=activate+qr+code+androidPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 17652 bytes
SHA-256: 8a4088e9656f4a39e217b7f612e7844f70c5ab34f094c3e32ddd2c5c8dcce7b8
font_02_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 10344 bytes
SHA-256: 1dae2393d2c76f175b576004a078e13393a4b0ed4670ecf4538eaa0ef8aaf3f2