Malicious PDF — malware analysis report

Static analysis result for SHA-256 228d54931dff5f7f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 22:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38f30ddf60282dedb98ad6e4ade562b6 SHA-1: c6d76c625b3560f6798f3d1a80c12abb00b94069 SHA-256: 228d54931dff5f7fb140172ecaac63360392c2f61c943b33ccb32fc74f20b9e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF is designed to redirect users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://maskaevlawyer.ru/userfiles/file/69348396895.pdf In PDF document text
    • http://vertracapital.com/uploads/files/jusukujegepowozoleg.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613670018eca1---wonaro.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dagubowidugadasorane.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18908053048.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/56385564499.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/kolavare.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/tomuto.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/3212874519.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/4057971147.pdfIn PDF document text
    • https://33mobility.net/uploads/files/welumomagodokuwuj.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jizumokoba.pdfIn PDF document text
    • http://juncheng.tw/upload/files/86736719103.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zazaxegibekivoja.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/popibojevewo.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/95912636698.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xojixanabebikajodovuga.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/66017306276.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905103842_g5yyl0.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/fukajabe.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/3274747579.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/banisijemin.pdfIn PDF document text
    • http://etre-belle.su/images/file/68618008256.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zuziruxem.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/sazarajubudubivogis.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/72234352366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mx+player+4k+supportPDF 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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 18016 bytes
SHA-256: 6f4873335356cf3ff33ea0edeb25e1722e75492078dbbff5a996fc528eed0540
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10528 bytes
SHA-256: 9a308d8f3bfc26c34e4c6b352da013779609344bc91d61bcaa1b9d2c6e42b7b9
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1