Malicious PDF — malware analysis report

Static analysis result for SHA-256 97771a59d94cc109…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 10:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62fab787314d3804db58adc7581c85bf SHA-1: 0face6ebba46f096cf1ee4fdb44b0a1edd4164f8 SHA-256: 97771a59d94cc109b3d4cd6299db34408a0fa16e12a9b1a0fb22de126717a293
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious purpose. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=make+chrome+dark+mode+android PDF link annotation
    • http://gevenschoenen.nl/ckfinder/userfiles/files/83022766317.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/52113904611.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pokezilagitipularusemane.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/99302268332.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/94690618412.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/gobopapof.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614628bab154c---makef.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/nabamefoz.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/5196992019.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/bidogavokuvidufowuboragek.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/reveferabasanakulu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kawed.pdfIn PDF document text
    • http://kisito.com/userfiles/file/faxur.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jonunaripuxurozagumij.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/27199163336.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e352db8c50---35091071767.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/begavavigizafigefetok.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/wuket.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/37379975323.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/11217298190.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/felalisopib.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/luxujuzevarope.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tigaxegegutani.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/loneto.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/vuweforebatenapuzazi.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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 15644 bytes
SHA-256: adc9108eec72b4bbf91305d3f904eaba8eaf3f6c66af069e1370a4c9be863f08
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 10408 bytes
SHA-256: ce8bb01f2424db32c5e2c69c6f52d5b55bb9d71af366381b693bfd413ac80fc5
font_02_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1