Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0bd309b3983b39…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 13:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edf6e134c5474e83e157d1c96fadfb33 SHA-1: 01da6374b0e4c367383be8fa6d44de668afd0615 SHA-256: 7b0bd309b3983b397352ba0d9f209ff9b65572ea3238deca574a578705b48656
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://borik.customreal.sk/data/files/45963516008.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/99759010628.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/rafuki.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/fazegujulipofajozotet.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/palemamunidiwusesifamulem.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/famozawuxadubi.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/foxedonuda.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/pibenibagevurelogomal.pdfIn PDF document text
    • https://tigaintan.com/contents/files/xowowugavepumigigijajoxev.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cadd5d499---75619315363.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/93145305344.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/d7513pl7oajnsgisurqga0lmt2/tonizomexes.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/24730773527.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/suvorebimatikejixor.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/21500376174.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/31188481713.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061651084960.pdfIn PDF document text
    • http://lagrupacio.cat/file/vibulexitopobupef.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/kipobegujesabi.pdfIn PDF document text
    • https://unitjaya.com/contents/files/tolesogefu.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/witidazata.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/10007242243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=google+spreadsheet+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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 17160 bytes
SHA-256: d8aca758440abedb8c7db7cba254247837711061d4acb76008e1ccdb37658016
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10712 bytes
SHA-256: 985855ccbc68ca7e92e505c5f96b1e87cb14700ee27a60733e357de6ef31b345
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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