Malicious PDF — malware analysis report

Static analysis result for SHA-256 945e3445303f80bd…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 20:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7dec883881204335d7419681a779476c SHA-1: 4ca72179106cc1347a7a2fa71be7fab1bbab7e9e SHA-256: 945e3445303f80bd3ea4df49a2ab2490830bb49bf1885f8c9deb6aaabb5d8c22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://simsvizag.com/contentimages/file/93340461004.pdf In PDF document text
    • https://golf-tout-terrain.com/publish/page/file/90801576472.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/14166409860.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/piguzatezomaditeje.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b26e92a63e8cd9d318bbb3b144b9b2bb/pidedisa.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/nimatusatuzibipesul.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/renekorigadaluruw.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/vorevexivo.pdfIn PDF document text
    • https://nevisnews.com/userfiles/zorogi.pdfIn PDF document text
    • http://effekt-film.de/files/file/97209174066.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614555faebd24---41426400775.pdfIn PDF document text
    • http://kco.su/userfiles/file/nekewaxiradapor.pdfIn PDF document text
    • http://thietkevang.com/upload/files/32000678057.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gizujavub.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/77196418752.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/62069588119.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/9503443326.pdfIn PDF document text
    • https://fultoys.com/userfiles/45506113007.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210919_113038_133.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/lidabupavajezufepaxeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=golwalla+textbook+of+medicine+pdfPDF 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_off0000aef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 16120 bytes
SHA-256: 8b5603e742a43a7e2c4d2f667a344727e0910c6eca82d65d9c54413dd4e3dc49
font_02_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 10972 bytes
SHA-256: e2ee424c85649cf5b2621e6b28e90e7df66e22f6a3e3d260599978203130adf0

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