Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27d4940475a5f2c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-23 18:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d10d0afc9245af608600f1f7c796c4a SHA-1: 452776c71d210b3e81f0f19f2874d19e5fa2ac64 SHA-256: f27d4940475a5f2ccfd386db227435ac66d465990979117ce1ef251c62b3a30c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to create a large number of links on disposable domains, characteristic of phishing or scam operations. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.afurg.com.br/assets/ckfinder/userfiles/files/wikutegowuxibep.pdf In PDF document text
    • http://yuc-fac.com/uploadfiles/20210906051256.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nikowixikekamoni.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b201a8c5d---98218595302.pdfIn PDF document text
    • http://mlight.cz/archiv/file/miwafipudikosi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/sarelebakokonorosakemat.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/3334070793.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/wuzugibilugimurip.pdfIn PDF document text
    • http://melvin.cz/data/63591960933.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/61389198433.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/pedujofekolo.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/16327448790.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/47867098952.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/sefavevusasubetemipas.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/resar.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/37196929804.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/92625341088.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c48251f3b---16330291556.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/85676095891.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/54650349754.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/95286470507.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/20561760990.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/75284210751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=madout+open+city+2PDF 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_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 18944 bytes
SHA-256: 37b26d992bd4aaa0f9e481c6513a7f9a89f9c083557b046cbb7d33f8f2307e4e
font_02_sfnt_off00013a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A06 10520 bytes
SHA-256: 0e0c46156498754217c5b6c4f43beaef8cfbf67d6f718a71d100a51f1e3d9ee1

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