Malicious PDF — malware analysis report

Static analysis result for SHA-256 78af122c6fdf3fc1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 16:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed96a50108ef81f58f2e823ab66b9ba1 SHA-1: 30bbc3d534ab0e1d73434131ed0a1a71084f7912 SHA-256: 78af122c6fdf3fc14e8b0d660aa901a9d317b769130ae4c109e03677898dbf7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or malware distribution. While no scripts were extracted, the structure and URL patterns strongly suggest it's designed to lure users to malicious sites.

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://lorofilmes.com/Uploads/ckfinder/userfiles/files/10319176226.pdf In PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/70501290605.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/18697452426.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/33235054839.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lbuvblb7c4d6b6k9dvdkka441m/95704413487.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/begekenupepunudagilinogut.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sijapanose.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613476bed08b3---tapezaxoxabijawidakigik.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/xepexokopeke.pdfIn PDF document text
    • http://www.puhito.hu/uploads/14153791977.pdfIn PDF document text
    • https://halead.com/uploadfile/1631688994.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nuwakeb.pdfIn PDF document text
    • http://email-database.info/userfiles/file/toxila.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/6744391020.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/bizofilolefogo.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/90370684746.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/mexanajovijo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/suwesevurar.pdfIn PDF document text
    • http://iucecb.com/files/file/zebajukuziwesogifoj.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210915165728_nfxp0s.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gafiwisop.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dokoniwokapaboj.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/noxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dragon+city+android+apkPDF link annotation
    • https://lapdonline.org/file/laxodipaxuxixonul.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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 18088 bytes
SHA-256: f86c59f1025d77660b71b4e0d47ca3229843b7b4edc9f3bfb5512ef8344cb758
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 10548 bytes
SHA-256: e8d74c33431580cc7d04488143f020dc7ef428a5099b0bd9f499495aa7745edd
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1