Malicious PDF — malware analysis report

Static analysis result for SHA-256 721ea8665bcdc97a…

MALICIOUS

PDF

84.0 KB Created: 2021-10-14 10:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2da26e2d5f5122ddaeef763a4b0839b7 SHA-1: ea01df94ae0fd9a37e990e76a0cfca448b806eb8 SHA-256: 721ea8665bcdc97a1fc844e97bab89ae28099c785f526c2f74e813fdc0584cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://timminsrenovations.ca/file/wv5w7LHkojuO5pCr.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/manumijen.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/mesukum.pdfIn PDF document text
    • http://hydrem.ru/images/file/92089385009.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/fakotenawopubelexora.pdfIn PDF document text
    • http://davcpundri.com/css/file/12728238958.pdfIn PDF document text
    • http://juentai.com/userfiles/files/radodoruvuferetotazavifar.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/papulavulenisazu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/48814006675.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/wifelidolesab.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090305011373499.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/68050300747.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/52875747946.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/jovinakukefakojumob.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/tinofenuvidajobux.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/74551384808.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/wewip.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/1141511130.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/99666340340.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616112e2d0e67---riwevoxut.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/siriwewokogolapodunewi.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/nezisabupefinotefetotob.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/gujirisojageraramegewipu.pdfIn PDF document text
    • http://evola.it/userfiles/files/9643789021.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/32576249106.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/32597196824.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=traditional+middle+eastern+musicPDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 18352 bytes
SHA-256: 8b945e83e3ffd3d16f66e2e3e628c326804771fdc2f2e48801239226341c27ee
font_01_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 10596 bytes
SHA-256: 11b88b509fadc02a3ba6f52b6948d2b8ace83e1427fe80b8e0cacb9be4c48d41
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1