Malicious PDF — malware analysis report

Static analysis result for SHA-256 558e48b8c52314ea…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02fc4d16282e042405cd1bc009586369 SHA-1: de85041a6eaef7367cc7bfe3c20f37f2baf7e260 SHA-256: 558e48b8c52314eacabcbd4610e0aad29aa509c4e87dd960fb4c1b86846ffe9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, with many redirecting to external sites. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic firing and the ML_NYX_PDF_MALICIOUS score indicate a high likelihood of malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://airzo.net/userData/board/file/fojewikufixativiluto.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/71820193531.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/bamidogibitodilividuwexor.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/subugegape.pdfIn PDF document text
    • https://protrialse.eu/files/files/kipizivamupap.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/dorufowinetupa.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/libov.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/27117075813.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/47021017291.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/2024699503.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/rufudimufinanilavame.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/dorakidexufuluxugelujalof.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/suloparemusa.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/39813550367.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/boxugefekunuzunalopegite.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/44388273182.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/mitaxoriroxitipipo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nb27qq84lb8f1vvjpfrd97ra8h/gowalerelivodesekizeduli.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/kofurimibulezaz.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dinepilojepozusuv.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210910125153_kmv8so.pdfIn PDF document text
    • http://labsshop.com/d/files/77963978286.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/kapikovoradoranogomode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v+download+on+mobilePDF 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_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 10472 bytes
SHA-256: ff36a77430bfa5d9bab8d20cd806ac7e8ee4e43b51cbd14dc57aa24d4bc0d702
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 20372 bytes
SHA-256: e585d8cad8b72a8524aaa2f5c00c92b7955eb432f23ec753caa1ab76562a286a
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1