Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49340442270990b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 16:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 936eeaa448e9c82a1723ef9eb8646035 SHA-1: baf03a756513ca5e9f032e4c3e3331e74d2e5f06 SHA-256: b49340442270990b092c5b9f6e0c63a169c848ceb1229fb0399f9bca335178ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cheliabinsk.realxenon.ru/uploads/files/82210140928.pdf In PDF document text
    • http://giorgimpianti.com/userfiles/file/zogabogukug.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02ae9880a---28648695123.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/22071501548.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/dujabimizelulus.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/ripokarix.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/20087901214.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nazadapajabagazujerisivo.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/16005754849.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/raweza.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/88603852230.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/wofuwexabamadiviji.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/jaxuzabinoz.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/83569526577.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/59091155.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/butakudana.pdfIn PDF document text
    • https://0900107678.com/upload/file/nopofedugawokogituwopag.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/mitojazonosofajod.pdfIn PDF document text
    • http://fitviewer.com/files/file/fatakuviloxifujaxo.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/febojo.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/28281030392.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/dd0081fa27de43e3e6cb57479a67d631/76898478335.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bifuza.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/67777785820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dictionnaire+fran%C3%A7ais+arabe+apk+offlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 18596 bytes
SHA-256: eb1b81fe6188da3a9e68f1ba7f72ecd2bcfbf99911bbec17fab0a44e1fa31720
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 10904 bytes
SHA-256: 5cb23fcdb725f4f8b34152473635f2ec6633efc792bfbc6070778b1c4e249b71
font_02_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1