Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ee01ae03539efd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 16:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53f3c5d6332c8dc333272c2d9cc2f49f SHA-1: 5f37b7e59ab7a0de05d95ab2010a9590c3e25b42 SHA-256: 57ee01ae03539efd4f8b9f348b107344b1109cfebbd686191c61d3ddf489de53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a tactic to manipulate search engine results or redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://fxlcd.com/upload/file/dogat.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/4413805540.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/zizifekonani.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/64337461991.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/9902643232.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5bd22f171---pizid.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6s5ci4c36efdhke5828t1guep3/sugojolijisumuviponorid.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091620240032.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/tirefemukogo.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/312539569.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/96081360825.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/90074179301.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/diwexela.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/88034964966.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/tumulijabemejivuna.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/51282096693.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/14015558264.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/kaxepuwasipozanidobam.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/zugaradixopelaf.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/lagedevotu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/51156931418.pdfIn PDF document text
    • http://vaynhe.com/upload/files/lofadizuki.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/tolafiwubajuko.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/nupijukevadonukilobudebed.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/70516492933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=atlas+vpn+iosPDF 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_off0000b627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 10060 bytes
SHA-256: 6d04742a1092477d3a26a3ce6feafe41ffee47adce313a154d92aa749953c8e3
font_02_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 17224 bytes
SHA-256: 3dc933e7d18a93beb071bfb11c2ab20d45f149e9cb131ead5a46c5ff5b6bce70

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