Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed3a57da6b59d9e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 12:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 188581af1d615ef3e42739cc1b1061f8 SHA-1: d3575d9fa03e7ed4caa80203fedede494b38c9a9 SHA-256: 3ed3a57da6b59d9e202d7391c29c4c055dbd511e684dfcba0a478c33cfa2edbd
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 trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple distinct links, reinforcing the phishing or malware distribution intent.

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 https://allytemp.ru/uplcv?utm_term=genshin+impact+redeem+code+free PDF link annotation
    • http://tinhdauvietnam.vn/upload/files/maxatixixotewuleri.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/pusixunegurefakomowoduli.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/51822174984.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/kigarovuwon.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/90718906795.pdfIn PDF document text
    • https://msiutilities.net/documents/25192041230.pdfIn PDF document text
    • http://centronegozi.com/public/27155886998.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/18b066166e8c3996aa470b22c04348a9/13510680268.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/96650883684.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/joremawilenotosusapesimaf.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/kafafabanuxesekis.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/79865108070.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/bijerupapoligowu.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/penolosikifes.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/83454760502.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/95160877712.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vudixiziradetibototulijan.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/85361826107.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zisenorobet.pdfIn PDF document text
    • http://khocabien.com/uploads/files/senunafuvotave.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dipetolejosolak.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sinunanejakalirire.pdfIn PDF document text
    • https://bem-sa.com/img/file/41897778165.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/90630414616.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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 18056 bytes
SHA-256: e50a558b1100635bf185e4fbeb2deb7228cac5d8273fbf43eede3f5cce1f68d4
font_02_sfnt_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 10876 bytes
SHA-256: 5615ea4b48bafe4f1c55d9d1824a8889cca30ad6c015b36474b51ddeaa9e5051