Malicious PDF — malware analysis report

Static analysis result for SHA-256 c021b1489ad7b95c…

MALICIOUS

PDF

103.0 KB Created: 2021-10-05 02:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b3e2e926e85acc5584ba425d17dbefb SHA-1: 82c74625df992131f2b93cdcc69f122a8b80ed55 SHA-256: c021b1489ad7b95cd67780c962466ade359d633fe046871692f740e72b6141bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=how+to+chicago+in+text+citation PDF link annotation
    • https://immsac.pe/sgi_userfiles/userfiles/files/99689240220.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/dinomofikomutewomere.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151432e7263f---fowafutolawokupibavot.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/58626480791.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jilesujo.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632672488.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/pizaxa.pdfIn PDF document text
    • https://andhimazhai.com/images/files/84573999559.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/84029105807.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/64045434947.pdfIn PDF document text
    • http://apple888.vn/luutru/files/69228091598.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/11707016899.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139389a94de1---69901012060.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/61064566361.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/49720692999.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/pulod.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/28106201548.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/59498369857.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/20589480443.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/93340854434.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/palogafixe.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/89800294646.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_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 10376 bytes
SHA-256: 39b44487508c690626ffa758775f7a71c3e179e1757cfd1ceecc589fec582cf6
font_02_sfnt_off00015826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15826 20892 bytes
SHA-256: 5c4b2dd635929d74d22b9158f41c2c9be68267f423c2eaf7656a574f6817e932

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