Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad9b68d3638e8ea…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 17:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 604cfc9347a481be0c06dfb5b3684406 SHA-1: 7fe92c5eb542d50e39976bbb22dc7a9f1de7c47b SHA-256: bad9b68d3638e8eaab2f1029855803bccc46055b4c1dd47b1575ba58291ee61a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of link farms on disposable hosting, further supporting the phishing or malware lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/fm0u1vlgpf42l49anv8mv54635k2v3pe/76170461509.pdf In PDF document text
    • http://mweb.cz/images/file/putenizigajugekenisumu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/75902145999.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lubenurazaxiwotofuget.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/zofizobetemukel.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/59208080662.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nunenisepivumasikasezaz.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/28651495160.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210913230720.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/44685518933.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909085646251744gjbnd.pdfIn PDF document text
    • http://fructusartis.com/i/File/67842159963.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/53538315063.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/15746926683.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/jazapuwiselixu.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/rewujabupivujezatoze.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/xivimil.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/zadupuxazokulabebu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/61791268887.pdfIn PDF document text
    • https://tadimtursu.com/image/files/donijonegipazalegujusilej.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109012118151342.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210907_4EB4D3EBBFD44EAC.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fcd4b6f23---64784077211.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/16519842528.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/85157059934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=activity+book+kindergarten+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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 18344 bytes
SHA-256: f4616c375db0b387f0d2121aff4c20baf6e85feb00bfcf802b0b37572fec8ece
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10972 bytes
SHA-256: 003174b896ca982ead75de3a9cf9e15bf6f3be658016c53a892ac7f052fab548