Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ae984ff39c3f17…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 20:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 911f04fcd9acb99d94452f3623bbe2fb SHA-1: 991792d77d60d7c1c8eb8db1af103aceef370c88 SHA-256: 51ae984ff39c3f17822f38cdf5c4a0db2eba5572c79a18c8e25d691dfb349e15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=whatsapp+only+working+on+wifi+android PDF link annotation
    • https://mt-creativestudio.com/ckfinder/userfiles/files/padamenifuzegob.pdfIn PDF document text
    • https://value.ae/userfiles/file/55565931681.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/sateden.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e9ac05f262d63ed237ee00599b513fe9/97155054325.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/85318267980.pdfIn PDF document text
    • http://unseretochter.com/images/file/pobekovax.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/7070216679.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/91393901799.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/33590641715.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/niduxorinalukofonefu.pdfIn PDF document text
    • https://heyratacademy.ir/file/jukabamejoletewuvefesevu.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/melowiseridexupomelazodo.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/15387156479.pdfIn PDF document text
    • http://giga.sk/storage/file/201728391.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/9635144641.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/fusegedevonu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c84430909---46046310845.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/jatixadekufugiwax.pdfIn PDF document text
    • http://deltools.com/userfiles/file/538935985.pdfIn PDF document text
    • https://digiconelectronics.com/media/59990108282.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/fitapuzakulakidelerum.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/83148556538.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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 10928 bytes
SHA-256: d5d7ac81e46ede9d11baa5ed23ebd776ad6c043000d373ebd8b689f8497e567d
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 18380 bytes
SHA-256: 68a1b1f1f559242cf6f3afdaac23d158817924bcf1e216f2156cf72bf7485254

Open this report in the interactive analyzer, or submit your own file for analysis.