Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1a9d80dbaec185…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 23:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70dfe7ae2f3ffb92d5081c8a256b17ae SHA-1: 724b0f0c6c43ff64de8bf472e85b40f07dd0a5cd SHA-256: 2c1a9d80dbaec18512bda62ea040bcc66b0144460cf066cf9d4c66a70a9c7ed8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=pokemon+extreme+red+download PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/nuwerimoviriropupe.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vupabupusodumu.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/dunodekufekuvugigutolal.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613614b2cc5fb---lefulalatozig.pdfIn PDF document text
    • https://badrivishal.com/media/3898169592.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/pituz.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/nidatoriruwarul.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/6351894851.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wasimikonaronan.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/91592611919.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/penomuraganopu.pdfIn PDF document text
    • http://erdbau-rauch.at/71288917129.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/xusilagubenoxexo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/40541669981.pdfIn PDF document text
    • https://producto.works/userfiles/file/98298663235.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/86588324495.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161403c6487ea0---vutofi.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/vuxefululipesogaranode.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-11-23-11-15-86.pdfIn PDF document text
    • http://medica-brno.com/files/17592156617.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/2932779041.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kimovu.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/66659009451.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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 18736 bytes
SHA-256: 7890f847b664e110a00d16526b81d9d9c471b1209af86ebee85bb2e183615cc9
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10428 bytes
SHA-256: 23629845dc4c72eeb13c9f6732f5f41e40282723f0b69283527a175faa3b95ce
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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