Malicious PDF — malware analysis report

Static analysis result for SHA-256 f834d0388905b0eb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 02:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f14e556320e7a512f36c15b500d621cb SHA-1: 84432d59693e1582570f355fe9d31aaeacf0cede SHA-256: f834d0388905b0eba3e2832b0ec1a7b080058469fdc664dab6c7044390b1c224
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=how+to+attach+obb+file+with+apk PDF link annotation
    • https://toscanafantastica.com/userfiles/file/sewipunubawajafulol.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/nefilusuzikupi.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/5146355378.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/funomerutezem.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/60775164212.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/15349835534.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134100e760af---sibifiziki.pdfIn PDF document text
    • https://rjpexport.com/files/98919967079.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/68680038863.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/89353141914.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/64cc4bdd78a5b9acf7a69ca525f432e0/genewamafogevabedopax.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041252199164.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/balilojitamofadokepon.pdfIn PDF document text
    • http://artepcb.com/upload/files/90142226853.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/kamuzokakugimasa.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/nazax.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/68282894270.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gunajuxujigaxogexazobo.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/69718762729.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/midepafavo.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/99615610240.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/vizotedugirelojebavi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/59888317645.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nugoxixosagib.pdfIn PDF document text
    • http://skupka23.ru/upload/m/pilomufarulisobupope.pdfIn PDF document text
    • http://www.mafiapaidapps.com/2018/01/how-can-iinstall-apk-with-obbdata-file.htmlIn PDF document text
    • https://mediaget.com/userfiles/files/70778102469.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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10516 bytes
SHA-256: af42b7a21864c7693988dce3051b6aaa0bc6abd4f22094f0c664b41b60d78d05
font_02_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 17872 bytes
SHA-256: a0dab65e32490b25eed824604e7ce5edffc0ce8feb4f68341464a6f3039263a4