Malicious PDF — malware analysis report

Static analysis result for SHA-256 28264adf8c6bc4ad…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 01:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5661b497763b5a36c2a0f48cc0eb4baf SHA-1: acd7796361d14da143095602244d7f635561cc80 SHA-256: 28264adf8c6bc4ad9881fcc24cdb44f2988d5efbf9557427b9d665a0a512f0f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://smidgel.ru/uplcv?utm_term=how+to+install+android+on+nokia+lumia+900 PDF link annotation
    • http://startent.ru/SITE/files/editor/file/wafero.pdfIn PDF document text
    • http://apismorava.eu/docs/66936781019.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/9267800469.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909125909.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/nexukexofed.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/rafitunejazosuk.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9814967b96231d9e033d78317981a98b/pujiralotaleramotizu.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zegejet.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/mudumaganere.pdfIn PDF document text
    • http://lg-palette.com/upload/files/27671722074.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/75168368037.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/44809356319.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/vifeleredupojex.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/185166313.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/36929816720.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fugogosajud.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/14931115786.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/besegusorafilozitopuz.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/mirasesazedonosarifozij.pdfIn PDF document text
    • http://www.centralperdana.com/file/pogevagotagatufizax.pdfIn PDF document text
    • http://edallyshop.com/upload/files/84456503322.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/71957989838.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091000382345.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 17796 bytes
SHA-256: 024298850a569d10a135208f27a2745bc921daf2fc29ba332074d433abe144d5
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 10836 bytes
SHA-256: 5509d623355b46462e9017089181401a92d367ba86a32fa501430fb79844d6c3

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