Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6017c447a4958cc…

MALICIOUS

PDF

95.7 KB Created: 2021-09-13 16:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7290be286dc737d48b46ff8bf1b8c03c SHA-1: f3cb04481217b6d647a5dc2e29e98050a80a4bbd SHA-256: c6017c447a4958cc4852f884cea83f8dc8246dc745a9d6039f9c90a309666444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, with a high heuristic score indicating it functions as a link farm on disposable hosting. The embedded URLs likely lead to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://casier-a-bouteilles.fr/file/rifutotutomiruniniw.pdf In PDF document text
    • http://teranor.com/ckfinder/userfiles/files/fuvowaxog.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/ruzarif.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/vanakerijodexuvena.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/xirutedalitijexapepe.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210908142312.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/36813928946.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfc165f39---wogepavapafip.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/50140445694.pdfIn PDF document text
    • http://domplus.su/userfiles/files/nironik.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/92097508016.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/36132935932.pdfIn PDF document text
    • http://ktcz.eu/files/files/10275461019.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/96914578711.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/76496705443.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/sarapesowegabepigadizoxe.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/410ef6d988230d2836efdfcf03fdeafd/vutenazisijig.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/wuwozemevudodi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nizuvugi.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bavokaxokavizomesirup.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/lidenefuwijusunowobuvamo.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/vewisaranowe.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mebul.pdfIn PDF document text
    • http://fruitvita.com/files/files/jebudisak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=strawberry+plant+specialized+structurePDF 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_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10960 bytes
SHA-256: 0d3610dfa5da00d20448f467b94fafa32629e813b792cb2da6d1d04401c7050e
font_01_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 18412 bytes
SHA-256: cc4eb99cf0854bc3edbd02ca1597c7f01940e9b6761599cea08d3d23c4a2f0dd
font_02_sfnt_off0001597e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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