Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2a62f535eeb395…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 18:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 360c72c91ef2afd305e24ec3c7e93571 SHA-1: 0b24924666272be794cfc2f96d9ba1c92913dab2 SHA-256: 3c2a62f535eeb3956ee47ede58bf5f36d9aade0f07e10033704e197a1f77541c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=genshin+impact+eu+code PDF link annotation
    • https://rainbowfurnitures.com/files/files/23256227137.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kusowuzoru.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/rakafasapu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/78783691975.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rilojiwubedusopogirigi.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/82263062044.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/61759612506.pdfIn PDF document text
    • http://inistor.com/ufiles/files/befabifagixerijuleziseze.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/sopakusope.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/defepunevesu.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/fodolirafetaf.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/34130152721.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/34129605500.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/fujixuk.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/biwijulidejumefanidus.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/21627031454.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/sukoxoradafek.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/89107503956.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/kuvudolamujozi.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/50465744486.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/resapinixamav.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/efiq4unkhsesatkplpphsffik5/godidofenopokodupovovave.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/rebuviriraruvukiti.pdfIn PDF document text
    • http://kotolantopeni.cz/file/62584976461.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387effac8a5---43298107705.pdfIn PDF document text
    • 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_off0000b03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03B 16172 bytes
SHA-256: 9f84a2f3b4817ed094794f26557de040ba600fa1e8e60d86aebf6ccf7d9360fe
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 10772 bytes
SHA-256: 3584a0901705811b1d185d701220c96cdc5f1fb210fec9c446778407aff4fb2a
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1