Malicious PDF — malware analysis report

Static analysis result for SHA-256 2126336aa3e32472…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c72eec9c42d8921ecf461322ca38224 SHA-1: f3bfe0ba290383e54dfeac6dc71e7f8b111ba87e SHA-256: 2126336aa3e32472cb1902f3d461cb4bf2c5b8b75b5510b50dbb10387274532f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and numerous distinct hosts suggest a deliberate attempt to obscure the final destination.

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 https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8c73dadb179f03b173e63dc42a7c4743/tadefeguvepazogedafogefok.pdf In PDF document text
    • http://ptaki.info/imgekoprojekty/files/23327956213.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/dudagawabobojudiguta.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/78805797964.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/zekajega.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/wisabijidova.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/87083711884.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/274759813.pdfIn PDF document text
    • http://vhktn.at/images/content/files/48900391387.pdfIn PDF document text
    • https://jobtiara.com/files/files/7251496030.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/kopomekeluliji.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/wizirup.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/zidefuduxofilit.pdfIn PDF document text
    • https://edusfera.pl/upload/file/61882703834.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/vojivokogegud.pdfIn PDF document text
    • http://steinemann-ag.ru/lagojumaretibamugilide.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/retimezegizibexosawu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410efe9ec7e---54091104715.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/46632755110.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/94617638058.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/91913433318.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/51432592020.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/nepexabejap.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xadonimugumepuboparirelip.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/22480555654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+house+of+darkness+the+house+of+light+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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 10932 bytes
SHA-256: 278bdff0d77427b168a9b5a3c6f0a2718678381591ec6dc7f0e7485c2f9d40c4
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 18840 bytes
SHA-256: d5d3ab046c6c768bfa8a87479d049e12ab9650ff71707d7a213decb0cb34b00c