Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf77d5a7423ee24…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3cddba4a30c4a03b7fbba8c567e73a14 SHA-1: b3289755afebc31bf0d9bd49476f01e767e9e91d SHA-256: 8bf77d5a7423ee2479fcf888216a4ace9a460f45688634a6b4727fe347121d54
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=p+for+words+in+english PDF link annotation
    • https://ms2oke.com/contents/files/worujuvoluvitetexuk.pdfIn PDF document text
    • http://195exim.com/datas/files/xusazeneni.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/fipowagap.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906092126.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/padukupekuw.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jibib.pdfIn PDF document text
    • http://dsfly.com/uploads/files/84863321797.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/48428878106.pdfIn PDF document text
    • https://sanidom.pl/img/file/fepudub.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/pajoxex.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/sijajumegovesitiko.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/15498430364.pdfIn PDF document text
    • https://basisangka.com/contents/files/89353717878.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/75304932213.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/nekuxikotes.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/46698193785.pdfIn PDF document text
    • https://tierlistei.ch/downloads/wotalogizuboxaweroz.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109251305231197.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/kigutinutexojojevinisu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/36569710171.pdfIn PDF document text
    • http://benrassam.com/uploads/files/81852915855.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/63145128514.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614947bade5e8---26392843771.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/refamaf.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_off0000afdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 16424 bytes
SHA-256: ac2f3aaebe0df4dde6af57111ef5237ca47fe1b93223fc795a955f44ad8ce607
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10460 bytes
SHA-256: 9c7fe0907e2a6fc259bdb5bf05f68cdc25b6b778aeedf617260a441e546389ca

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