Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1b6db235b7627e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 00:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3de0874fadaab0075d213b87cb59571 SHA-1: 60ad624ad9e535f3144c0cc124962fed6389d43c SHA-256: 1d1b6db235b7627ecca866d995b18ec9c1e2ec9e160aaa7bb9a2b9e08ceb8270
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=install+live+net+tv+on+android+phone PDF link annotation
    • https://ywint.com/ckfinder/userfiles/files/1631908310.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/55518183579.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/zokifudozefo.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/radiruwinomadegi.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/42870949073.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46491265668.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/38604125890.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/dagufaboravomorisebaxobur.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/84905843606.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dbcf5416b11ea0cb7a00c9ddc8e40568/lutewovuzajodegad.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/roxuxexugoligaxepu.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/27904545721.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/65078927121.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/27664975029.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/redinunamosexuzude.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/relabivegilovilodefe.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/36208618217.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139921aafdcd---58947523224.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/65196985321.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/jajetalavofonaneger.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/zakipujebokivelopewipewi.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/79857007460.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/88031963382.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/25993267791.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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 10508 bytes
SHA-256: 6b255a322ee9043ca822f727c98f23fed30bed69fe5ecf99e9f71929f2dd424c
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 17236 bytes
SHA-256: c88a301732e2c3ad13cf5fe5f2d8d86440ef72e132adcae7fd9ee03340966d6c