Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c7eb2dcd59b8f8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 14:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3c19abbb3aedf76c250dd998898222f8 SHA-1: 124bacd3bbc3f5d4c137d369447a0ef2f7951eee SHA-256: d6c7eb2dcd59b8f8002c1e8ba76aaba32e693025b9ea880a4d179fec2699351c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to link farms and disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hatdesechia.com/storage/ckfinder/files/mosaxekuvewerimixejumerem.pdf In PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/pupezofebimesokepibibelar.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/32123816385.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/10056974098.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/34039178170.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/97756728321.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/pexejo.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/fenisijufeje.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/84639841326.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/jiwoxufowiwopixadorituba.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/medisufofunapesikumubo.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/86534065114.pdfIn PDF document text
    • http://espokebar.com/uploads/files/87270635209.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/62593483153.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/famizikexaleko.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/wejati.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/85093415701.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f8f3cd8a8---35530303101.pdfIn PDF document text
    • http://scro.ru/pic/file/mivibokinijomubebiba.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/55757219882.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/52278542464.pdfIn PDF document text
    • https://zzwgjx.com/d/files/lujomokepelidomijekix.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/zomuvesukisonepug.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/4381565197.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/mixinanoritela.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/18821111412.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1938cf2d3---54664976561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+moon+galaxy+gba+downloadPDF 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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10668 bytes
SHA-256: 1b56c379156789661cf00ae1a34062e64e73c5077b48289782164916e4055585
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 20204 bytes
SHA-256: 13c3aa56092cc30103c502973e1b29bd4c262f005f3079f4956eb9cd859f36f8