Malicious PDF — malware analysis report

Static analysis result for SHA-256 684ea1ec8b150596…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 18:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 13561fa427fde91fd5aa16869c0ff917 SHA-1: 01df0a63272682e35de972e2f582a47b4a926725 SHA-256: 684ea1ec8b150596cd65782a5f5f1024cf057c367c1edce752dbd872a73e815f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://abwingssuffolk1.com/uploads/files/kabuviz.pdf In PDF document text
    • http://gamax-motor.cz/data/dokumenty/64280094718.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/gemepibipijavaxufe.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/kepufixus.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/zoteko.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jumatonoxekidumineled.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tikiwamerasi.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/38114063284.pdfIn PDF document text
    • http://labotinnghia.com/img/files/727004104.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/75930894227.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/zifivenom.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/gagufivejalagedatibaje.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/bisonofizikemani.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/kunot.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sebevakudilo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d3e350e0---lagowizigefasuter.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109060649581827.pdfIn PDF document text
    • https://aitalk.vn/upload/files/17209141493.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1c9835bd7a7dec60b57de8c88ce08c46/80200883803.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/wevuvesafefe.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zigaxufogofupotagem.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bebexepajovomodizum.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/dagajimimotosizejuxuvina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+signal+booster+app+for+androidPDF 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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 17628 bytes
SHA-256: 6158f157999cef1b82d9882c28a10ffcca01c9616224a2ae9230f650774e918d
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 10864 bytes
SHA-256: c441c2d65a323e8e27c4bf14ba437683e2e450a589c21fc689dfd6b7239a9cba

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