Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6e1b4a8739bf3c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 07:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0c2c6128f03e79c93288b25b6090c598 SHA-1: 8d30f7e2d4a4735d39cc5bf11cb6731a900c0dc2 SHA-256: 4c6e1b4a8739bf3cb5b8119ec27a2f5f31734c617695c90315879cf77704c5fc
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were extracted, the structure and heuristic firings suggest an attempt to host or redirect to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://accapierre.it/userfiles/files/basafinizadusal.pdf In PDF document text
    • https://gaadalagi.com/contents/files/dunen.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/wogusapimogefiwu.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/diwefubulozoxufuzewol.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/bidaxeromunedi.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/94143466329.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/1095769854.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/sebem.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/fugiveweluro.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/jabugukukevagakebafubewop.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/96305436527.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/10717133532.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/24684243905.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/nojaxufelemafapezi.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/86827643253.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/39891051209.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/siguzajoleroza.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/xoxewurazu.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/77866063897.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/faretozajevu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/kedonib.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/23899402496.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/xafataguwajomifobeneja.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/telifikijelesadafetaz.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/11493604026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apps+edit+gambar+blurPDF 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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 18096 bytes
SHA-256: 5ce9494131d6d6c8fd6e966008c205b4785e03cec839bc72468c93d8c8cf394a
font_01_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 10732 bytes
SHA-256: 701a3dd41c09495bd844c52ad1604ddea9c6489fc97eb4245fa7dad9c715e4e2