Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc4b8cc776f2b8b…

MALICIOUS

PDF

112.4 KB Created: 2021-10-05 21:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca7a892e5c1b390f1efb48c5c2d030e4 SHA-1: bcbefb6bc3675653c1c1794f68c0a8e64e4920bd SHA-256: 3dc4b8cc776f2b8b7b52668ba4a352e49f06c53ad3653499edf75a119a7f3588
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://vuason.vn/upload/files/wawakidebiwemefaxebapa.pdf In PDF document text
    • http://dworbieland.pl/userfiles/file/54010757592.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138df1c39241---58676566171.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/tipeviveluwaz.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/17911909331.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/moluwopaseretud.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/fogod.pdfIn PDF document text
    • http://standdominica.org/files/files/33261179488.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/suvedijewuwozilel.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/75910949300.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/fobexedajepovave.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/kerakojobij.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/95764742989.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/349607b2f6cf58f99cc4b336fc7fee80/zuzimakelodoridu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/fovavuvevuw.pdfIn PDF document text
    • https://tierlistei.ch/downloads/88643873654.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/wolaji.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/donegoxa.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/latasadimisovutizabezitej.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/pazuwevuxojodugizeduki.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/rivajejike.pdfIn PDF document text
    • http://onelove.cz/file/buranebuzexuzimizosuv.pdfIn PDF document text
    • https://eternalbliss.net/file/72753541943.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dufatugonenosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=relative+clause+of+characteristicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_01_sfnt_off000143c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C1 24864 bytes
SHA-256: f19ede62beef6feb07abaef0efc22c8c9743e281650f51aee838ccf3b0f5d99d
font_02_sfnt_off000182df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF6 10540 bytes
SHA-256: 86958925c61f186ee09e1311aa5c4d783edf401966f503b50df82c8ce2b5038f

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