Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b240a73cc7dcd1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 12:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4bf0eab099378e7cb993d322a7a1834 SHA-1: 0e2642cbdc054c297db5d376e7f6c6c94c8e2425 SHA-256: 00b240a73cc7dcd18d8a55c4b897f14eb14d69b297d96ce26b3f4edc570ab6dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=avidemux+for+android PDF link annotation
    • https://cathita.vn/upload/files/37978991209.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/jiwabawoponupu.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/gakiradobomokinu.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/96541993779.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5af4b1230---dogukinanuruw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161487caa759c1---dibosogeteti.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/21448300508.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinoka.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/bubak.pdfIn PDF document text
    • http://stisk.com/file/mojura.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/turusopufedeg.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gumofonurujamugipozowexo.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/nixiguzadokat.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/89226804125.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/20103809007.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/tobomubelufex.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lozonuduwaxituvovizokizip.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/koxijederowutus.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/tozixizozuf.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/45903207313.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/11258312195.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/65804106648.pdfIn PDF document text
    • https://niceppl.com/images/file/joxogavatexiwir.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/3916123376.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_off0000afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB4 16596 bytes
SHA-256: c98d3df9aa7b486ecfe38ea3de77540f261602c83cf171739c1812b366bd81a1
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10452 bytes
SHA-256: 192128c7bd0570a5fd07fb299459901e21763a1de8282752ca2e8af73b9afdf5
font_02_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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