Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1174345dc5aa4b7…

MALICIOUS

PDF

92.3 KB Created: 2021-09-22 14:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61a7eb824b7ace56e871108ec51ecbd2 SHA-1: 70963a5487c82d53d87370e9c660f7b1bbce841c SHA-256: b1174345dc5aa4b770f0b75568f43935d9c5777630589eeeb9a88b2eb19ad497
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://loyd.rs/images/file/81044981282.pdf In PDF document text
    • https://rwd.webseo.tw/upload/files/49394207362.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/45961992128.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210916005329117.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/49452003901.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/gilunimesuvexegup.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/funekesoganosulafazen.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/47243115845.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/sesorib.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/tewoxupejamufisokumesixo.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/wotexemifori.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0ca4614---4484650516.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/57213635376.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/sixewumozikirikakesa.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/16899370960.pdfIn PDF document text
    • http://packturf.fr/files/67680678675.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/guluvazuke.pdfIn PDF document text
    • http://offerparts.com/upload/files/77932809547.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/rabusemi.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/lamaxen.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/16978987093.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/tutevoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=latest+kodi+builds+2021PDF 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_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 17264 bytes
SHA-256: b5e658fd2d4ae496ba77d09297c79bf3bab436cb74af7bc7262853f5b8c9a283
font_02_sfnt_off00014b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4F 10620 bytes
SHA-256: ebf6481043b9e258c0e1a7514bfbb8869dddf0d4362e2784b0e6da855593d531

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