Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c20d7076b19004…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5a3560040917e47ee0ef0b159a742201 SHA-1: 584ded46933581deac127793c97d11164f2d8f11 SHA-256: 33c20d7076b190046cf8eec409f2e227b54516ddc669130098cbb854ba0af2f0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social-engineering lure to trick users into installing a browser extension or update. The document contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mwasafat.com/uploads/files/siwisojexejurutu.pdf In PDF document text
    • http://haiqi-machine.com/d/files/lakawetagopukinebu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/48679676440.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/lemanukanexezokafifabeb.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210912071221.pdfIn PDF document text
    • http://ranch.pl/files/file/48528216997.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/purakejexagim.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/merugotoroxoledarogogo.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/71799529269.pdfIn PDF document text
    • http://bscartridge.com/pic/78107300068.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/63192352542.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/29659459113.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/53686338114.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/losagazupuwi.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/21536430389.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/58876585351.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/didarul.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906044630.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/piliwaruxukojudal.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/55639419282.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/81968822675.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gogerebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=deleting+facebook+messages+on+androidPDF 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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17732 bytes
SHA-256: 97219180e942413090233fc3be488e1a184b025e73b15cfd8f16c90cc04e8b77
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 11052 bytes
SHA-256: d80bb08938541d8e246df4052842e94c95625053eea301a9d016278eff8b4900

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