Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a3677a616c03d7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 09:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 484f720aebafbcc18743c7842376ca75 SHA-1: 1d667a63187eb86dc0e7588a578cf5bb0f0d41ee SHA-256: 04a3677a616c03d7c18983a1a510ad5a4f4e38e059923489dbd3a7c6acbb954b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hjhchem.com/upload/files/pezofemat.pdf In PDF document text
    • http://cheumst.com/upload/fckeditor/file/45881842688.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/modalowekinuxiromiv.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/pejelow.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/37768229851.pdfIn PDF document text
    • http://secretinvitation.net/images/files/92206378284.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/kujetaroxibuj.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/93993626981.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/66841826713.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/96744472739.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/56117496520.pdfIn PDF document text
    • http://osayit.com/images/file/47030590656.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/25752855004.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/fisegozorivarudikorojad.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/21928626441.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zisuxa.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/korojosisonim.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/14421523649.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167313a603---56652090186.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/womuzeputugebotewujetox.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109030352381227.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/57583901742.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/60396156752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bein+sports+live+stream+free+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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10776 bytes
SHA-256: 63bf6de86204ecda8472a733be0c86e226b1ed2a9426fee69397cba4ee93882b
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 17800 bytes
SHA-256: 9c5d4c7481fe9fe4168deb74d33d06c24bb38329d3306ac4980659a8b8689d11

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