Malicious PDF — malware analysis report

Static analysis result for SHA-256 46853b9b1159df8f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 19:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ea3d0f616a3e553993373697b273eac SHA-1: bf8251468bd8daf9db079dc44b682bbcb9d9bf2d SHA-256: 46853b9b1159df8f43713347f8baf483a1b1ca9ec73b137081a3381d32272fc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no specific script was extracted, the PDF structure and link farm heuristic strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gekon.net/userfiles/file/digadadusegiwe.pdf In PDF document text
    • http://mobitransjogja.com/files/noxuzobofitipupova.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/93483567954.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210909020951.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/mabije.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/71341281738.pdfIn PDF document text
    • http://safetruck.gr/images/file/kufapesokelujelevejutodo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109090849193942.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/21480576702.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/6015820191.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/83861160147.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161340b282c62d---66779611375.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/93459865963.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/wodowujigusite.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/43592758306.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nerina.pdfIn PDF document text
    • https://partnermind.cz/images/files/tupibo.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907062002.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/98702065511.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/24512769539.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/17959460816.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vismi4eq3qd86a0qev9qs8vq1k/9576137466.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/gulasikatujagu.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/23212886327.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/1068483676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=knocked+up+full+movie+123moviesPDF 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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 19468 bytes
SHA-256: 9918f0bd2ac3d98b9bbbc81a5c37de423a29147679048e67d221e72b51dfa5a4
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 11016 bytes
SHA-256: db8a97f394f1fd6beffbf01073debc74462e9ace70cba9ef4f629e58601a9632