Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e868b1cee9c017b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 03:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d749262ba3e25d89ff2bb9ffdcda2de SHA-1: 1c2fbfbd1017e328a78bf5b3d1facaf9da271c94 SHA-256: 1e868b1cee9c017bec6df6a471cb21e7e2b06beaca083adef4082d8ff31dd389
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs that redirect to other PDF files, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://fuze-pay.com/ckfinder/userfiles/files/xusem.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d0ebd643---59714411975.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/65061424939.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/42404791720.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/4186862378.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/29813070884.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/9760757965.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/32587946021.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/dofarumo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jasawuvo.pdfIn PDF document text
    • http://vkts.se/userfiles/file/90207361546.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/80860422999.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/dusowusetaxube.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909053300566842.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/pimexaded.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/65709998534.pdfIn PDF document text
    • http://insei.eu/userfiles/files/mipujikavoj.pdfIn PDF document text
    • https://gornjastubica.hr/files/rowowuxibuvavez.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0dca6f85b555030693d95e2eb2baccb9/33105038537.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/tesixudut.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/vomatusuwotil.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/kofiparexisabojatom.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/37443983146.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/93380820789.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/xirezose.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/9511757434.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081834156812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=boruto+195+onlinePDF 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_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10280 bytes
SHA-256: f80cdb129ecb18339d79507f095cd45578f7222da2607d4ea82c34ddb666872e
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 18640 bytes
SHA-256: 4bdfbac02760c444e343a26955bae1b356bc60b8b569e6abaf704e9a7c64758a