Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5dfe8df5f5081b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 13:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f702eb773dc4466a77d206d6f6863ac SHA-1: 55bef24e63b8ee8616230dfdfa8ed84008751113 SHA-256: 8f5dfe8df5f5081b8b15b95edd762da15bcad77c9201ecdf80572dd78e6ed42c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high-confidence heuristic indicating a payment redirection lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into fraudulent financial transactions or credential theft. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9a015b36---mizosajusokeburivor.pdf In PDF document text
    • http://studiodrago.eu/userfiles/files/datasepegugukube.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/38566123486.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/54208203625.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/49066277834.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/movitumidazuvenozegizap.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/2815866410.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/jurid.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/95287305912.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/pimugofipim.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/96471287387.pdfIn PDF document text
    • https://solturism.ro/images/file/21495591051.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/pexedizex.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/33531036432.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/gatuvekejuvugi.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/31564779636.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51887352757.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/rexilusadagapukasizuvi.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/2745954144.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jofab.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/38137180598.pdfIn PDF document text
    • https://telenovella-bg.com/files/72505225252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=move+text+messages+to+sd+card+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_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 10828 bytes
SHA-256: fb3a01b357002a2636bc2db2be63a68a568c33e2c6ca3844648af3cc421273e9
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 18000 bytes
SHA-256: 43a518c70db69f4cf533a9eef3a6914c9c9b356877264c0d662249ef1873dd08

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