Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d740c4924e6c44b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 22:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bc003a098b29083f228c1b83969d476d SHA-1: 30cdf87271be524b33bec8335eab5dcddaaf27a1 SHA-256: 9d740c4924e6c44b2e8346fd0dd056ba4ede59e23c0bf41ef596d94f6bcd9226
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=how+to+root+your+phone+with+kingroot PDF link annotation
    • https://tonymusic.se/UserFiles/files/38922021296.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/feniwopoxizeseru.pdfIn PDF document text
    • https://kokomanis.com/contents/files/6302292258.pdfIn PDF document text
    • https://verner.lt/images/files/jonis.pdfIn PDF document text
    • http://planetamama.ru/files/file/gapafezoza.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/94268131251.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/kazafinotepevunibaroze.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/8635416609.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/radumadejiwijukugunene.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912070650.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/toxanakef.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ruxoxafazegitigez.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/88861804365.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17360423759.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/84489701149.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/fomiguruzinabe.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/37566237834.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/37999488157.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/tumavazuxasibapasabakazas.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/24606835213.pdfIn PDF document text
    • https://kratky.eu/files/file/50115130108.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f25fa81233---80314348008.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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 17084 bytes
SHA-256: 1fe5a220e2cea213fe364c6416da47c6a029c4a24fcc5713274c564e37194d63
font_01_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 10540 bytes
SHA-256: f44b0125a2dedc72e02b9add73a6d153045ce57d4e7ab30fa11338fed0ef4800
font_02_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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