Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0779e03b4e3906…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c12a2fc0e6f3e1400a3cf20d95c342e8 SHA-1: 8a369074efa44003932e2658b5e7d364b7239c7e SHA-256: ad0779e03b4e3906b97a6de67b547466b75fbff9be09ffed72390de3100fcfc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm or phishing lure. The PDF structure and embedded content suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://laboratoriologos.it/userfiles/files/remaw.pdf In PDF document text
    • https://blokhol.com/upload/files/fidevikidijuruze.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/csbln9h31jtmrv6h2c6l71l452/57159011059.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/89483985333.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/pavewo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903195354.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/75430449787.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/talobexotolutibokonadugo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109132037156820.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d81c3d6---85235361561.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/teloperiwez.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gukuvekebeboniwiwir.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/9935329480.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/36882378207.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/51808432685.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kuvokarixelivirejutafa.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/selatunoronewub.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/tapoterigevebav.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/mekolivagogafapalut.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/temijumajusedetububigikar.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde32981d4---xuvebagudasomozizugijime.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/77846439595.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/dokunefidelefex.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/lomovidudenoxeginawopesi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jizekikotopuwepaborixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=edoz+v2ray+vpn+apkPDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 18356 bytes
SHA-256: 0a2063278b1c17def3acad4611a3494779a61c673f8a42a858c8bc492ca8596f
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 10284 bytes
SHA-256: 05d8ba8e93b678ff6c1f834cff41d1c7d59288d12fa1bc99a43a50da8ff17080