Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdb18c2b9d7a277…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 16:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa5fe53106ecbee12516e49ebf4e8f9f SHA-1: eea968ae8c36d4bd9575b58c5182e1b97a48c6e2 SHA-256: 6bdb18c2b9d7a277d2c8efb2c8192361c53f7aad335f92303e03ea16fec32765
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ateliergermain.net/sites/default/files/file/89080925891.pdf In PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/vojinapowuma.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/36746173414.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/bubivana.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/87670643295.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/rigavejopolelinetodexojif.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vovigobisapinimurogowo.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/4869003259.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/42201169256.pdfIn PDF document text
    • https://lecachet.fr/docs/files/23679981453.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144de80e57dd---torevi.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/segijunujep.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vapebitejowakat.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/giborofevolofazoro.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/kixijimokisub.pdfIn PDF document text
    • https://airxps.com/userfiles/files/nodibawatupuwudibiziwujud.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/rovofijifiwuxijopetafo.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/gonoxifimeb.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109030408328152.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/nosovenir.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/mapivefapodo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/897c2924fe7d0870f7fa823459532ef9/xobidurapesoto.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44176910333.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/josibuvek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+understand+that+my+phone+is+hackedPDF 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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 18204 bytes
SHA-256: 1cb0df6efe552cf8cb9f1b0d5b223e85dec8c8d21c0b636578391172961ad3b2
font_01_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A07 11116 bytes
SHA-256: 0dbeb47197d92722f28985a64e9eae8cf896d650fbc902efed8b2cab0e139a3e