Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83dcdd2f7914a7a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 07:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b06e489d18e379774bc2839d412b862 SHA-1: 42568849d697b75f2e2fcdd87976742770588fb6 SHA-256: a83dcdd2f7914a7a5e6fdf19be1fa112c7658b0a66edd310216dd80d33de7ba6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The PDF structure and embedded links indicate an attempt to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=battle+through+the+heavens+season+1+watch+online PDF link annotation
    • http://pcccmiennam.com/media/ftp/file/rofebunojoduk.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c43409ccd---nigipawogowisiwofisev.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/28726265961.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/94522011839.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bd1965a09303d7f96cdcbd9705c73973/gonidevejegibubagawebo.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/30011777177.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/sojivivadel.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/zefibufesuvitisireve.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/tuvenopavetobinovofub.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sawobalizir.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/36632745561.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wepaxu.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/32932874704.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/96942967700.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/powapurupukan.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/58165406280.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/47216587074.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109251317082302.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/gokevub.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109140947173572.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///74779949864.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/54726339415.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/tiwane.pdfIn PDF document text
    • https://pellevah.com/upload/files/53852863333.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/6054126992.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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 16896 bytes
SHA-256: e512656828315a341519ce96a00d79dde2efa925120b59ae4ecb0d81fbd772fa
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10864 bytes
SHA-256: b15c7e3e769673dbbc4bf2076cb1163defbafe2135c6088c85c3ab7f73f523c7

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