Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3b397b436d8904…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 21:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc026610ca3bd800d95a89608535a5e5 SHA-1: 62fad99f3955e6ecdae628760f4ae636e189b511 SHA-256: 3f3b397b436d8904b6d3174464e32a5fb2eb5470911fd0c7dc403837e79c8329
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely leading to a malicious second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://modelseafarm.com/kweb/ckfinder/userfiles/files/58010898436.pdf In PDF document text
    • http://nguoiquangphianam.com/uploads/files/romolepuw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86b730a63---refexitabukozomariwafosur.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/55364597034.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/078f9a5c94bd586d502e2ba242492142/dizozarezonosa.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/57863358350.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/jojalajapelusuxorunoz.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/32100532544.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/73601688840.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/fazewarinavadopuf.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/19684226324.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/50952942269.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/tasowukawajaxuxexun.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/15429633816.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/loxip.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/82947095908.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/55840463142.pdfIn PDF document text
    • http://kes.org/upload/editor/files/fevodomasirofivur.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/sadoxekibozetosa.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/75515434036.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/xagitefak.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/83461950075.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/26542355085.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tobifesumoniroxali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=story+of+seasons+friends+of+mineral+town+android+apkPDF 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_off0000ba9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9F 18076 bytes
SHA-256: f16223255cc57bb8d9ae0e72b829ed1be62391eee9a22da7040e2069c9bf3622
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 11024 bytes
SHA-256: c2a2b7cca721ee1d76c7d15233a58978c5af76049ae419eef9a9f8a026c61704
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1